case study class 10 science chapter light

Case Study Questions Class 10 Science Light Reflection and Refraction

Case study questions class 10 science chapter 10 light reflection and refraction, case study:1, case study: 2, case study:3.

While convex mirrors are used as rear view mirror in vehicles to see the traffic behind the person for safe driving. As these mirrors are curved outwards they has wider field of view. In convex mirrors the image formed is always diminished, virtual and erect.

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Class 10 Science: Case Study Chapter 10 Light Reflection and Refraction PDF Download

In CBSE Class 10 Science Paper, Students will have to answer some questions based on  Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given.

Here we are providing you with Class 10 Science Chapter 10 Light Reflection and Refraction Case Study Questions, by practicing these Case Study and Passage Based Questions will help you in your Class 10th Board Exam.

Case Study Chapter 10 Light Reflection and Refraction

Here, we have provided case-based/passage-based questions for Class 10 Science  Chapter 10 Light Reflection and Refraction

Case Study/Passage-Based Questions

Question 1:

The spherical mirror forms different types of images when the object is placed at different locations. When the image is formed on the screen, the image is real and when the image does not form on-screen, the image is virtual. When the two reflected rays meet actually, the image is real and when they appear to meet, the image is virtual. A concave mirror always forms a real and inverted image for different positions of the object. But if the object is placed between the focus and pole, the image formed is virtual and erect. A convex mirror always forms a virtual, erect, and diminished image. A concave mirror is used as a doctor’s head mirror to focus light on body parts like eyes, ears, nose, etc., to be examined because it can form erect and magnified images of the object. The convex mirror is used as a rear view mirror in automobiles because it can form a small and erect image of an object.

(i) When an object is placed at the center of curvature of a concave mirror, the image formed is

Answer: (c) same size as that of the object

(ii) No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

Answer: (d): The image is erect in a plane mirror and also in a convex mirror, for all positions of the object.

(iii) A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.

Answer: (c) : As the image of head is bigger, the upper portion of magic mirror is concave. The middle portion of the image is of same size, so, middle portion of magic mirror is plane. Now, the image of legs looks smaller, therefore, the lower portion of magic mirror is convex.

(iv) To get an image larger than the object, one can use (a) convex mirror but not a concave mirror (b) a concave mirror but not a convex mirror (c) either a convex mirror or a concave mirror (d) a plane mirror.

Answer: (b) a concave mirror but not a convex mirror

(v) A convex mirror has wider field of view because (a) the image formed is much smaller than the object and large number of images can be seen (b) the image formed is much closer to the mirror (c) both (a) and (b) (d) none of these.

Answer: (c) both (a) and (b)

Question 2:

The lenses form different types of images when objects are placed at different locations. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.

When a ray goes through the optical center of the lens, it passes without any deviation. If the object is placed between the focus and the optical center of the convex lens, an erect and magnified image is formed.

As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also, the size of the image goes on increasing and the image is always real and inverted.

A concave lens always gives a virtual, erect, and diminished image irrespective of the position of the object.

(i) The location of image formed by a convex lens when the object is placed at infinity is (a) at focus (b) at 2F (c) at optical center (d) between Fand 2F

Answer: (a) at focus

(ii) When the object is placed at the focus of concave lens, the image formed is (a) real and smaller (b) virtual and inverted (c) virtual and smaller (d) real and erect

Answer: (b) virtual and inverted

(iii) The size of image formed by a convex lens when the object is placed at the focus of convex lens is (a) small (b) point in size (c) highly magnified (d) same as that of object

Answer: (c) highly magnified

(iv) When the object is placed at 2F in front of convex lens, the location of image is (a) at F (b) at 2 F on the other side (c) at infinity (d) between F and optical center

Answer: (b) at 2 F on the other side

(v) At which location of object in front of concave lens, the image between focus and optical centre is formed (a) anywhere between centre and infinity (b) at F (c) at 2F (d) infinity

Answer: (a) anywhere between centre and infinity

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Case Study Chapter 10 Light Reflection and Refraction

Please refer to Chapter 1 Light Reflection and Refraction Case Study Questions with answers provided below. We have provided Case Study Questions for Class 10 Science for all chapters as per CBSE, NCERT and KVS examination guidelines. These case based questions are expected to come in your exams this year. Please practise these case study based Class 10 Science Questions and answers to get more marks in examinations.

Case Study Questions Chapter 1 Light Reflection and Refraction

Case/Passage – 1 A 5.0 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm.

Question: What is the power of the used lens? (a) + 5 D (b) – 5 D (c) + 0.5 D (d) – 0.5 D   

Question: What is the distance of image from the pole of lens? (a) v = 60 cm (b) v = – 60 cm (c) v = 30 cm (d) v = –30 cm 

Case/Passage – 2

Light travels through a vacuum at a speed c = 3 × 108 m/s. It can also travel through many materials, such as air, water and glass. Atoms in the material absorb, reemit and scatter the  light, however. Therefore, light travels through the material at a speed that is less than c, the actual speed depending on the nature of the material. To describe the extent to which  the speed of light in a material medium differs from that in a vacuum, we use a parameter called the index of refraction (or refractive index).

Question: Figure shows a ray of light as it travels from medium A to 

medium B. Retractive index of the medium B relative to medium A is (a) √3/2 (b)√2/3 (c)√1/2 (d) √2

Question:The path of a ray of light coming from air passing through a rectangular glass slab traced by four students shown as A, B, C and D in the figure. Which one of them is correct?

(a) A (b) B (c) C (d) D   

Question: A light ray enters from medium A to medium B as shown  

in the figure. The refractive index of medium B relative to A will be  (a) greater than unity (b) less than unity (c) equal to unity (d) zero

Question: You are given water, mustard oil, glycerine and kerosene.  In which of these media, a ray of light incident obliquely at same angle would bend the most? (a) Kerosene (b) Water (c) Mustard oil (d) Glycerine   

Question: A ray of light is incident in medium 1 on a surface that separates medium 1 from medium 2. Let v1 and v2 represent the velocity of light in medium 1 and medium 2 respectively. Also let n12 and n21 represent the refractive index of medium 1 with respect to medium 2 and refractive index of medium 2 with respect to medium 1, respectively. If i and r denote the angle of incidence and angle of refraction, then- (a) sin i/sin r = n 21 V 1 /V 2 (b) sin i/sin r = n 21 V 2 /V 1 (c) sin i/sin r = n 12 V 1 /V 2 (d) sin i/sin r = n 12  V 2 /V 1   

Case/Passage – 3 Inside a substance such as glass or water, light travels more slowly than it does in a vacuum. If c denotes the speed of light in a vacuum and v denotes its speed through some other substance, then v = c/n where n is a constant called the index of refraction. To good approximation, a substance’s index of refraction does not depend on the wavelength of light. For instance, when red and blue light waves enter water, they both slow down by about the same amount. More precise measurements, however, reveal that n varies with wavelength. Table presents some indices of refraction of Custon glass, for different wavelengths of visible light. A nanometer (nm) is 10– 9  meters. In a vacuum, light travels as c = 3.0 × 10 8  m/s 

Question: Inside Custon glass (a) Orange light travels faster than yellow light (b) Yellow light travels faster than orange light (c) Orange and Yellow light travels equally fast (d) We cannot determine which color of light travels faster 

Question: Which of the following phenomena happens because n varies with wavelength (a) A lens focuses light (b) A prism breaks sunlight into different colors (c) Total internal reflections ensures that light travels down a fiber optic cable (d) Light rays entering a pond change direction at the pond’s surface 

Question: For blue-green of wavelength 520 nm, the index of refraction of Custon glass is probably closest to (a) 1.49 (b) 1.50 (c) 1.51 (d) 1.52 

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Light Reflection and Refraction Case Study Based Questions Class 10

Students who are studying in CBSE class 10 board, need to get the knowledge about the Light Reflection and Refraction Case Study Based Questions. Case based questions are generally based on the seen passages from the chapter Light Reflection and Refraction. Through solving the case based questions, students can understand each and every concept. 

 With the help of Light Reflection and Refraction Case Study Based Questions, students don’t need to memorise each answer. As answers for these case studies are already available in the given passage. Questions are asked through MCQs so student’s won’t take time to mark the answers. These multiple choice questions can help students to score the weightage of Light Reflection and Refraction. 

Light Reflection and Refraction Case Study Based Questions with Solutions 

Selfstudys provides case studies for the Class 10 Science chapter Light Reflection and Refraction with solutions. The Solutions can be helpful for students to refer to if there is a doubt in any of the case studies problems. The solutions from the Selfstudys website are easily accessible and free of cost to download. This accessibility can help students to download case studies from anywhere with the help of the Internet. 

Light Reflection and Refraction Case Study Based Questions with solutions are in the form of PDF. Portable Document Format (PDF) can be downloaded through any of the devices: smart phone, laptop. Through this accessibility, students don't need to carry those case based questions everywhere. 

Features of Light Reflection and Refraction Case Study Based Questions

Before solving questions, students should understand the basic details of Light Reflection and Refraction. Here are the features of case based questions on Light Reflection and Refraction are:

• These case based questions start with short or long passages. In these passages some concepts included in the chapter can be explained.
• After reading the passage, students need to answer the given questions. These questions are asked in the Multiple Choice Questions (MCQ). 
• These case based questions are a type of open book test. These case based questions can help students to score well in the particular subject. 
•  These Light Reflection and Refraction Case Study Based Questions can also be asked in the form of CBSE Assertion and Reason .

Benefits of Solving Light Reflection and Refraction Case Study Based Questions

According to the CBSE board, some part of the questions are asked in the board exam question papers according to the case studies. As some benefits of solving Light Reflection and Refraction Case Study Based Questions can be obtained by the students. Those benefits are: 

• Through solving case studies students will be able to understand every concept included in the chapter Light Reflection and Refraction
• Passages included in the case study are seen passages, so students don’t need to struggle for getting answers. As these questions and answers can be discussed by their concerned teacher. 
• Through these students can develop their observation skills. This skill can help students to study further concepts clearly. 
• Case studies covers all the concepts which are included in the Light Reflection and Refraction

How to Download Light Reflection and Refraction Case Based Questions? 

Students studying in CBSE class 10 board, need to solve questions based on case study. It is necessary for students to know the basic idea of Light Reflection and Refraction Case Study Based Questions. Students can obtain the basic idea of case based questions through Selfstudys website. Easy steps to download it are:

• Open Selfstudys website. 

• Bring the arrow towards CBSE which is visible in the navigation bar. 

• A pop-up menu will appear, Select case study from the list. 

• New page will appear, select 10 from the list of classes. 

• Select Science from the subject list. 

• And in the new page, you can access the Light Reflection and Refraction Case Study Based Questions. 

Tips to solve Light Reflection and Refraction Case Study Questions-

Students should follow some basic tips to solve Light Reflection and Refraction Case Study Based Questions. These tips can help students to score good marks in CBSE Class 10 Science. 

• Generally, the case based questions are in the form of Multiple Choice Questions (MCQs). 
• Students should start solving the case based questions through reading the given passage. 
• Identify the questions and give the answers according to the case given. 
• Read the passage again, so that you can easily answer the complex questions. 
• Answer according to the options given below the questions provided in the Light Reflection and Refraction Case Study Based Questions. 

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Case Study Questions Class 10 Science Chapter 10 Light Reflection and Refraction

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CBSE Board Exam is on the way, so you must practice some good Case Study Questions Class 10 Science to boost your preparation to score 95+% on Boards. In this post, you will get Case Study and Passage Based Questions that will come in CBSE Class 10 Science Board Exams .

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on  Assertion and Re a son . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Light Reflection and Refraction Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 10 Science  Chapter 10 Light Reflection and Refraction

Case Study/Passage-Based Questions

Question 1:

The spherical mirror forms different types of images when the object is placed at different locations. When the image is formed on the screen, the image is real and when the image does not form on-screen, the image is virtual. When the two reflected rays meet actually, the image is real and when they appear to meet, the image is virtual. A concave mirror always forms a real and inverted image for different positions of the object. But if the object is placed between the focus and pole, the image formed is virtual and erect. A convex mirror always forms a virtual, erect, and diminished image. A concave mirror is used as a doctor’s head mirror to focus light on body parts like eyes, ears, nose, etc., to be examined because it can form erect and magnified images of the object. The convex mirror is used as a rear view mirror in automobiles because it can form a small and erect image of an object.

(i) When an object is placed at the center of curvature of a concave mirror, the image formed is

Answer: (c) same size as that of the object

(ii) No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

Answer: (d): The image is erect in a plane mirror and also in a convex mirror, for all positions of the object.

(iii) A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.

Answer: (c) : As the image of head is bigger, the upper portion of magic mirror is concave. The middle portion of the image is of same size, so, middle portion of magic mirror is plane. Now, the image of legs looks smaller, therefore, the lower portion of magic mirror is convex.

(iv) To get an image larger than the object, one can use (a) convex mirror but not a concave mirror (b) a concave mirror but not a convex mirror (c) either a convex mirror or a concave mirror (d) a plane mirror.

Answer: (b) a concave mirror but not a convex mirror

(v) A convex mirror has wider field of view because (a) the image formed is much smaller than the object and large number of images can be seen (b) the image formed is much closer to the mirror (c) both (a) and (b) (d) none of these.

Answer: (c) both (a) and (b)

Question 2:

The lenses form different types of images when objects are placed at different locations. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.

When a ray goes through the optical center of the lens, it passes without any deviation. If the object is placed between the focus and the optical center of the convex lens, an erect and magnified image is formed.

As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also, the size of the image goes on increasing and the image is always real and inverted.

A concave lens always gives a virtual, erect, and diminished image irrespective of the position of the object.

(i) The location of image formed by a convex lens when the object is placed at infinity is (a) at focus (b) at 2F (c) at optical center (d) between Fand 2F

Answer: (a) at focus

(ii) When the object is placed at the focus of concave lens, the image formed is (a) real and smaller (b) virtual and inverted (c) virtual and smaller (d) real and erect

Answer: (b) virtual and inverted

(iii) The size of image formed by a convex lens when the object is placed at the focus of convex lens is (a) small (b) point in size (c) highly magnified (d) same as that of object

Answer: (c) highly magnified

(iv) When the object is placed at 2F in front of convex lens, the location of image is (a) at F (b) at 2 F on the other side (c) at infinity (d) between F and optical center

Answer: (b) at 2 F on the other side

(v) At which location of object in front of concave lens, the image between focus and optical centre is formed (a) anywhere between centre and infinity (b) at F (c) at 2F (d) infinity

Answer: (a) anywhere between centre and infinity

Case Study 3: Light reflection and refraction are fundamental phenomena that occur when light interacts with surfaces and passes through different mediums. Reflection is the bouncing back of light when it strikes a surface. The laws of reflection state that the angle of incidence is equal to the angle of reflection, and the incident ray, reflected ray, and normal at the point of incidence lie in the same plane. Refraction, on the other hand, is the bending of light as it passes from one medium to another with a different optical density. The bending of light is governed by Snell’s law, which states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for a given pair of media. The concepts of reflection and refraction help us understand various optical phenomena, such as the formation of images by mirrors and lenses, the dispersion of light, and the phenomenon of total internal reflection.

What is reflection? a) The bending of light as it passes from one medium to another b) The bouncing back of light when it strikes a surface c) The formation of images by mirrors and lenses d) The dispersion of light Answer: b) The bouncing back of light when it strikes a surface

What do the laws of reflection state? a) The angle of incidence is equal to the angle of reflection b) The incident ray, reflected ray, and normal lie in the same plane c) The angle of incidence, angle of reflection, and normal form a right triangle d) All of the above Answer: d) All of the above

What is refraction? a) The bending of light as it passes from one medium to another b) The bouncing back of light when it strikes a surface c) The formation of images by mirrors and lenses d) The dispersion of light Answer: a) The bending of light as it passes from one medium to another

What law governs the bending of light during refraction? a) Law of reflection b) Snell’s law c) Newton’s law d) Coulomb’s law Answer: b) Snell’s law

What optical phenomena can be explained using the concepts of reflection and refraction? a) Formation of images by mirrors and lenses b) Dispersion of light c) Total internal reflection d) All of the above Answer: d) All of the above

Hope the information shed above regarding Case Study and Passage Based Questions for Class 10 Science Chapter 10 Light Reflection and Refraction with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 10 Science Light Reflection and Refraction Case Study and Passage Based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible. By Team Study Rate

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Class 10 Physics (India)

Course: class 10 physics (india)   >   unit 1, light class 10: cbse previous question paper problems.

• Convex/Concave - lenses & mirrors: CBSE board practice

Spherical mirrors

• Solution A1. ( i ‍   ) Pole: The centre of the reflecting surface of a spherical mirror. [ 0.5 ‍   marks] ( ii ‍   ) Centre of curvature: The reflecting surface of a spherical mirror is part of a sphere. The centre of that sphere is called centre of curvature. [ 0.5 ‍   marks] ( iii ‍   ) Principal axis: An imaginary line passing through the pole and the centre of curvature. The principal axis is normal to the mirror at the pole. [ 0.5 ‍   marks] ( iv ‍   ) Principal focus: The point on the principal axis, at which incident light rays parallel to the principal axis converge or appear to diverge from, is called the principal focus of the lens. [ 0.5 ‍   marks]
• Related video : Spherical mirrors, radius of curvature & focal length .
• Solution A2. ( i ‍   ) The headlights of a car use concave mirrors. [ 2 / 3 ‍   marks] Reason: When the headlight bulb is placed at the principal focus of the concave mirror, it produces a strong forward beam consisting of parallel rays of light. [ 1 ‍   mark] ( ii ‍   ) The rear-view mirrors use convex mirrors. [ 2 / 3 ‍   marks] Reason: A convex mirror, due to its curvature, directs light from a wider angle to the eye of the viewer. It also produces an erect image of the traffic behind. [ 1 ‍   mark] ( iii ‍   ) A solar furnace uses concave mirrors. [ 2 / 3 ‍   marks] Reason: The concave mirror focuses parallel rays of light coming from the sun at the principal focus. The concentration of sunlight at the principal focus produces a lot of useful heat. [ 1 ‍   mark]
• Related exercise : Applications of concave and convex mirrors .
• Related videos : ( i ‍   ) Concave mirror applications , ( ii ‍   ) Convex mirror & applications .
• Solution A3. ( i ‍   ) [ 1 ‍   mark] ( ii ‍   ) [ 1 ‍   mark] ( iii ‍   ) [ 1 ‍   mark]
• Related exercises : ( i ‍   ) Ray diagrams , ( ii ‍   ) Ray diagrams and curved mirrors .
• Related video : Convex & concave mirror ray diagrams .
• Solution A4. Only convex mirrors produce images that are always virtual and diminished. [ 1 ‍   mark] It is seen that the image ( I ‍   ) is virtual and diminished irrespective of the position of the object ( O ‍   ). [ 2 ‍   marks]
• Related videos : ( i ‍   ) Concave mirrors , ( ii ‍   ) Convex mirror & applications .
• Solution A5. ( i ‍   ) A magnification of + 1 / 3 ‍   indicates an erect and diminished image. Only a convex mirror produces such an image. [ 0.5 ‍   marks] ( ii ‍   ) Position of object: Between infinity and the pole. [ 0.5 ‍   marks] The diagram below shows that for any position of the object between ∞ ‍   and P ‍   , the convex mirror always forms an erect and diminished image. [ 1 ‍   mark]
• Solution A6. ( i ‍   ) The mirror is concave since it forms a real image. [ 0.5 ‍   marks] ( ii ‍   ) A magnification of − 1 ‍   implies that both the object and image are located at the centre of curvature, C ‍   . The distance of the image from the object is zero. [ 0.5 ‍   marks] ( iii ‍   ) The radius of curvature is 50   cm ‍   . So, the focal length is 25   cm ‍   ( 1 / 2 × ‍   radius of curvature). [ 1 ‍   mark] ( iv ‍   ) The image formation is shown below. [ 1 ‍   mark]
• Related exercises : ( i ‍   ) Nature and size of images from magnification , ( ii ‍   ) Using the magnification formula for mirrors .
• Related video : Magnification formula for mirrors .
• object distance, u = − 4   m ‍   ,
• image distance, v = + 1   m ‍   .
• object distance, u = − 20   cm ‍  
• image distance, v = ? ‍  
• magnification, m = − 3 ‍   .
• Related exercises : ( i ‍   ) Using the magnification formula for mirrors , ( ii ‍   ) Nature and size of images from magnification .
• object distance, u = − 30   cm ‍   ,
• image distance, v = − 60   cm ‍   .
• Related exercise : Using the mirror formula .
• Related videos : ( i ‍   ) Solve example: Mirror formula , ( ii ‍   ) Mirror formula .
• object distance, u = − 18   cm ‍  
• focal length, f = ? ‍  
• magnification, m = + 1 3 ‍   .
• Related exercise : Concave and convex mirrors .
• Solution A10. Range of object distance : The object must be between the pole and the focus of the concave mirror for an erect image. The range of the object distance, u ‍   , is, 0   cm < u < 20   cm ‍   . [ 1 ‍   mark] Two other characteristics of the image: ( i ‍   ) virtual, ( ii ‍   ) enlarged. [ 1 ‍   mark] Ray diagram: [ 1 ‍   mark]

Refraction of light and spherical lenses

• Solution A11. ( i ‍   ) The central point of a lens is called its optical centre . A ray of light passes undeviated through the optical centre of any lens. [ 0.5 ‍   marks] ( ii ‍   ) Each spherical surface of a spherical lens forms a part of a sphere. The centres of these spheres are called the centres of curvature . [ 0.5 ‍   marks] ( iii ‍   ) The principal axis of a lens is an imaginary line passing through its two centres of curvature. [ 0.5 ‍   marks] ( iv ‍   ) The aperture of a spherical lens is the diameter of its circular outline. [ 0.5 ‍   marks] ( v ‍   ) The point on the principal axis, at which incident light rays parallel to the principal axis converge or appear to diverge from, is called the principal focus of the lens. [ 0.5 ‍   marks] ( vi ‍   ) The distance between the optical centre and the principal focus of a spherical lens is called its focal length , denoted by the letter f ‍   . [ 0.5 ‍   marks]
• Related videos : ( i ‍   ) Convex lenses , ( ii ‍   ) Concave lenses .
• Solution A12. ( a ‍   ) The ray diagram is shown below. The object is placed between O ‍   and F 1 ‍   . [ 1 ‍   mark] ( ii ‍   ) The object distance ( u ‍   ) and the image distance ( v ‍   ) are both negative. [ 1 ‍   mark] These are related to the focal length of the lens, f ‍   , by the lens formula, 1 f = 1 v − 1 u ‍   . [ 1 ‍   mark]
• Related exercise : Lenses and ray diagrams .
• Related video : Sign convention for mirrors (& lenses) .
• Solution A13. Lateral displacement: When a ray of light is incident obliquely on a parallel-sided glass slab, the emergent ray shifts laterally. The perpendicular distance between the incident ray and the emergent ray is called lateral displacement. [ 1 ‍   mark] Diagram: [ 1 ‍   mark] The factors on which lateral displacement depends are: ( i ‍   ) the thickness of the refracting material, ( ii ‍   ) the refractive index of the material. [ 1 ‍   mark]
• Related video : Refraction through glass slab .
• absolute refractive index of glass, n G = 3 2 ‍  
• absolute refractive index of water, n W = 4 3 ‍  
• speed of light in glass, v G = 2 × 10 8   m/s ‍   .
• Related exercise : Refractive index and the speed of light .
• Related videos : ( i ‍   ) Absolute & Relative refractive index , ( ii ‍   ) Relative & absolute R.I. connection .
• Solution A15. The first lens of focal length f 1 = + 50   cm ‍   is a convex lens. The second lens of focal length f 2 = − 50   cm ‍   is a concave lens. [ 1 ‍   mark] Power of the convex lens, P 1 = 1 f 1 = 1 + 0.5   m = + 2   D ‍   [ 0.5 ‍   marks] Power of the concave lens, P 2 = 1 f 2 = 1 − 0.5   m = − 2   D ‍   [ 0.5 ‍   marks] The concave lens always gives a virtual and diminished image irrespective of the object's position. [ 1 ‍   mark]

• object distance, u = − 30   cm ‍  
• image distance, v = + 60   cm ‍  
• height of the flame (object), h O = + 3   cm ‍  
• Related exercise : Using magnification formula for lenses .
• Related videos : ( i ‍   ) Lens formula , ( ii ‍   ) Magnification formula for lenses , ( iii ‍   ) Solved example on lens formula .
• Solution A17. A convex lens forms an image of magnification − 1 ‍   when the object is placed at 2 F ‍   . For focal length, f ‍   , we have, 2 f = 20   cm f = 10   cm = 0.1   m ‍   [ 1 ‍   mark] Power of the lens, P = 1 f ‍   , P = 1 0.1   D = 10   D ‍   [ 1 ‍   mark]
• Related exercise : Power of lens .
• Related video : Power of lens .

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NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

Chapter 10 Light Reflection and Refraction Class 10 NCERT Solutions

Ncert solutions for class 10 science chapters:.

Why do we prefer a convex mirror as a rear-view mirror in vehicles?

What is meant by power of a lens, what is absolute refractive index, when a convex lens will act as magnifying glass, which mirror give an erect and enlarged image of an object, contact form.

NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12

NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

September 27, 2019 by Veerendra

NCERT Solutions For Class 10 Science Chapter 10 Light Reflection and Refraction : In this article, you candidates can find light reflection and refraction class 10 NCERT solutions. Working on the light chapter of class 10 NCERT solutions will help candidates to build a strong foundation over the subject Physics. Knowing light reflection and refraction class 10 questions and answers will help students of class 10 to bag a decent score in class 10 board exams as well.

Along with NCERT Solutions For Class 10 Science Chapter 10 Light Reflection and Refraction candidates can also find light reflection and refraction class 10 numericals questions in this article.  Go through them will help candidates get a clear idea about how to approach the problems which in turn helps you to solve them in the most efficient way. So why wait? Read on to find out everything about light reflection and refraction class 10 important questions with answers here.

Before getting into the details of  NCERT Solutions For Class 10 Science Chapter 10 Light Reflection and Refraction,  let’s have an overview of topics and subtopics under NCERT class 10 science book activities solutions chapter 10:

• Light – Reflection And Refraction
• Reflection Of Light
• Spherical Mirrors
• Refraction Of Light

Free download NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction PDF in Hindi Medium as well as in English Medium for CBSE, Uttarakhand, Bihar, MP Board, Gujarat Board, and UP Board students, who are using NCERT Books based on updated CBSE Syllabus for the session 2019-20.

• प्रकाश-परावर्तन एवं अपवर्तन कक्षा 10 विज्ञान हिंदी में
• Class 10 Light Reflection and Refraction Important Questions
• Light Reflection and Refraction Class 10 Notes
• Light Reflection and Refraction NCERT Exemplar Solutions

Class 10 Science Light Reflection and Refraction Mind Map

Ncert solutions for class 10 science chapter 10 intext questions.

Page Number: 168

Question 1 Define the principal focus of a concave mirror. Answer: The principal focus of a concave mirror is a point on its principal axis to which all the light rays which are parallel and close to the axis, converge after reflection from the concave mirror.

Question 2 The radius of curvature of a spherical mirror is 20 cm. What is its focal length? Answer: Focal length = \(\frac { 1 }{ 2 }\) x Radius of curvature = \(\frac { 1 }{ 2 }\) x 20 cm = 10 cm

Question 3 Name a mirror that can give an erect and enlarged image of an object. Answer: Concave mirror.

Question 4 Why do we prefer a convex mirror as a rear-view mirror in vehicles ? Answer: We prefer a convex mirror as a rear-view mirror in vehicles because of two reasons :

•  A convex mirror always produces an erect image of the objects.
•  The image formed in a convex mirror is highly diminished or much smaller than the object, due to which a convex mirror gives a wide field of view of the traffic behind. A convex mirror enables the driver to view such larger area of the traffic behind him.

Page Number: 171

Question 1 Find the focal length of a convex mirror whose radius of curvature is 32 cm. Solution: R = +32 cm and \(f=\frac { R }{ 2 } =+\frac { 32 }{ 2 } =+16cm\)

Page Number: 176

Question 1 A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal ? Why ? Answer: The light-ray bends towards the normal because the ray of light goes from a rarer medium to a denser medium.

Question 3 Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density. Answer: From table 10.3, diamond has highest refractive index (= 2.42), so it has highest optical density. Air has lowest refractive index (= 1.0003), so it has lowest optical density.

Question 4 You are given kerosene, turpentine and water. In which of these does the light travel fastest ? Use the information given in Table 10.3. Answer: For kerosene, n = 1.44 For turpentine, n = 1.47 For water, n = 1.33 Because water has the lowest refractive index, therefore light travels fastest in this optically rarer medium than kerosene and turpentine oil.

Question 5 The refractive index of diamond is 2.42. What is the meaning of this statement? Answer: By saying that the refractive index of diamond is 2.42, we mean that the speed of light in diamond is lower by a factor of 2.42 relative to that in vacuum.

Page Number: 184

Question 1 Define 1 dioptre of power of a lens. Answer: One dioptre is the power of a lens whose focal length is 1 metre.

NCERT Solutions for Class 10 Science Chapter 10 Textbook Chapter End Questions

Question 1 Which one of the following materials cannot be used to make a lens ? (a) Water (b) Glass (c) Plastic (d) Clay Answer: (d) Clay

Question 2 The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object ? (a) Between the principal focus and the centre of curvature (b) At the centre of curvature (c) Beyond the centre of curvature (d) Between the pole of the mirror and its principal focus. Answer: (d) Between the pole of the mirror and its principal focus.

Question 3 Where should an object be placed in front of a convex lens to get a real image of the size of the object ? (a) At the principal focus of the lens (b) At twice the focal length (c) At infinity (d) Between the optical centre of the lens and its principal focus. Answer: (b) At twice the focal length.

Question 4 A spherical mirror and a thin spherical lens have each a focal length of -15 cm. The mirror and the lens are likely to be : (a) Both concave. (b) Both convex. (c) the mirror is concave and the lens is convex. (d) the mirror is convex, but the lens is concave. Answer: (a) Both concave

Question 5 No matter how far you stand from mirror, your image appears erect. The mirror is likely to be (a) plane (b) concave (c) convex (d) either plane or convex. Answer: (d) Either plane or convex.

Question 6 Which of the following lenses would you prefer to use while reading small letters found in a dictionary ? (a) A convex lens of focal length 50 cm. (b) A concave lens of focal length 50 cm. (c) A convex lens of focal length 5 cm. (d) A concave lens of focal length 5 cm. Answer: (c) A convex lens of focal length 5 cm.

Question 8 Name the type of mirror used in the following situations. (a) Headlights of a car. (b) Side/rear-view mirror of a vehicle. (c) Solar furnace. Support your answer with reason. Answer: (a) Concave mirrors are used as reflectors in headlights of cars. When a bulb is located at the focus of the concave mirror, the light rays after reflection from the mirror travel over a large distance as a parallel beam of high intensity.

(b) A convex mirror is used as a side/rear-view mirror of a vehicle because

• A convex mirror always forms an erect, virtual and diminished image of an object placed anywhere in front it.
• A convex mirror has a wider field of view than a plane mirror of the same size.

(c) Large concave mirrors are used to concentrate sunlight to produce heat in solar furnaces.

Question 13 The magnification produced by a plane mirror is +1. What does this mean ? Answer: Since magnification, \(m=\frac { { h }^{ ‘ } }{ h } =\frac { -\nu }{ u }\). Given, m = +1, so h’ = h and ν = -u

(i) m = 1 indicates the size of image is same as that of object. (ii) positive sign of m indicates that an erect image is formed.

The opposite signs of ν and u indicate that image is formed on the other side of the mirror from where the object is placed i.e., image is formed behind the mirror and thus image formed is virtual.

Reflection of light by curved surfaces; Images formed by spherical mirrors, center of curvature, principal axis, principal focus, focal length, mirror formula (Derivation not required), magnification. Refraction; laws of refraction, refractive index. Refraction of light by spherical lens; Image formed by spherical lenses; Lens formula (Derivation not required); Magnification. Power of a lens;

Formulae Handbook for Class 10 Maths and Science

Question 1. Define the principal focus of a concave mirror? Answer: Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.

Question 2. The radius of curvature of a spherical mirror is 20 cm. What is its focal length? Answer: Radius of curvature, R = 20 cm Radius of curvature of a spherical mirror = 2 x Focal length (f) f = R/2 = 20/2 =10cm

More Resources for CBSE Class 10

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• NCERT Solutions for Class 10 Science
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• NCERT Solutions for Class 10 Hindi
• NCERT Solutions for Class 10 Sanskrit
• NCERT Solutions for Class 10 Foundation of IT
• RD Sharma Class 10 Solutions

Question 3. Name the mirror that can give an erect and enlarged image of an object. Answer: When an object is placed between the pole and the principal focus of a concave mirror, the image formed is virtual, erect, and enlarged.

Download NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction PDF

Question 4. Why do we prefer a convex mirror as a rear-view mirror in vehicles? Answer: Convex mirrors give a virtual, erect, and diminished image of the objects placed in front of them. They are preferred as a rear-view mirror in vehicles because they give a wider field of view, which allows the driver to see most of the traffic behind him.

Question 1. Find the focal length of a convex mirror whose radius of curvature is 32 cm. Answer: Radius of curvature, R = 32 cm Radius of curvature = 2 x Focal length (f) R = 2f f = R/2 = 32/2 = 16cm Hence, the focal length of the given convex mirror is 16 cm.

Question 2. A concave mirror produces three times magnified (enlarged) real image of object placed at 10 cm in front of it. Where is the image located? Answer: Given, u = – 10 cm Since image is real inverted so, m = -3 m = -v / u ⇒  -3 = -v/ -10 v= – 30 cm Negative sign indicates the image will be real and image is formed at 30 cm in front of the mirror.

Question 1. A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why? Answer: The light ray bends towards the normal. When a ray of light travels from an optically rarer medium to an optically denser medium, it gets bent towards the normal. Since water is optically denser than air, a ray of light travelling from air into the water will bend towards the normal.

Question 1. Define one dioptre of power of a lens? Answer: One dioptre is the power Of a lens Of focal length 1m. Power of lens is defined as the reciprocal of its focal length. If P is the power of a lens of focal length F in metres, then P = 1/ f (in meters) The S.I. unit of power of a lens is Dioptre. It is denoted by D. 1 dioptre is defined as the power of a lens of focal length 1 metre. 1 D = 1 m−1

Question 2. A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the lens if the image is equal to the size of the object? Also find the power of the lens. Answer: v = + 50 cm Since image is real and of same size. The position of image should be double the focal length. Hence, the object should be at 2f. V = 2f = 50, f = 25 cm. Power = 1/f = 100/25 = 4D

Question 1. Which one of the following materials cannot be used to make a lens? (a) Water (b) Glass (c) Plastic (d) Clay Answer: (d) Clay

Question 2. The ¡mage formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object? (a) Between the principal focus and the centre of Curvature (b) At the centre of curvature (c) Beyond the centre of curvature (d) Between the pole of the mirror and Its principal focus. Answer: (d) Between the pole of the mirror and its principal focus.

Question 3. Where should an object b. placed In front of a convex lens to get a real image of the size of the object? (a) At the principal focus of the lens (b) At twice the focal length (c) At infinity (d) Between the optical centre of the lens and its principal focus Answer: (b) At twice the focal length

Question 4. A spherical mirror and a thin spherical lens have each a focal length of 15 cm. The mirror and the lens are likely to be: (a) both concave (b) both convex (c) the mirror is concave, but the lens is convex (d) the mirror is convex, but the lens is concave Answer: (a) Both concave.

Question 5. No matter how far you stand from a mirror, your Image appears erect. The mirror is likely to be (a) plane (b) concave (c) convex (d) Either plane or convex Answer: (d) Either plane or convex.

Question 6. Which of the following lenses would you prefer to use while reading small letters found ¡n a dictionary? (a) A convex lens of focal length 50cm (b) A concave lens of focal length 50cm (c) A convex lens of focal length 5 cm (d) A concave lens of focal length 5 cm. Answer: (c) A convex lens of focal length 5 cm.

Question 8. Name the type of mirror used in the following situations. (a) Headlights of a car (b) Side/rear-view mirror of a vehicle (c) Solar furnace Support your answer with reason. Answer: (a) Concave mirror, to get powerful and parallel beams of light. (b) Convex mirror because it always gives an erect image and enables the driver to view much larger area. (c) Concave or parabolic mirror because it can concentrate sunlight at the focus to produce heat in the solar furnace.

Question 9. One half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations. Answer: Yes, even when one half of the lens is covered with a black paper, complete image of the object will be formed. Take a convex lens and focus the light from a distant object onto a screen. As expected an image (sharp) is formed at a distance equal to the focal length Cover the lower or the upper half of the lens and focus the light from the same object onto the same screen. You will be able to get a sharp image again; however the brightness of the image will be less in the second case. The same effect w,ll be seen even if the lens is half covered with black strips.

Question 13. The magnification produced by a plane mirror is +1. What does this mean? Answer: This means that size of the image is equal to the size of the object.

Multiple Choice Questions (MCQs) [1 mark each]

Question 1. Hold a highly polished steel spoon curved inwards close to your face and move it slowly away from your face. What will you observe? (a) Enlarged and erect image of your face (b) Smaller and inverted image of your face (c) Smaller and erect image of your face (d) Enlarged and inverted image of your face Answer: (b) The inner curved surface of a highly polished steel spoon acts as a concave mirror. When the spoon is at a small distance from the face such that, the object lies between pole and focus of concave mirror, so an enlarged and erect image of your face will be observed but as the spoon is slowly moved away from the face, the image becomes smaller and appears inverted.

Question 2. Which one of the following materials cannot be used to make a lens? [NCERT] (a) Water (b) Glass (c) Plastic (d) Clay Answer: (d) Clay can never be transparent, so it cannot be used to make lens.

Question 3. No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be [NCERT] (a) plane (b) concave (c) convex (d) either plane or convex Answer: (d) Plane mirrors and convex mirrors always form the erect images.

Question 4. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object? [NCERT] (a) Between principal focus and centre of curvature (b) At centre of curvature (c) Beyond centre of curvature (d) Between pole of the mirror and its principal focus Answer: (d)

Question 6. A spherical mirror and a thin spherical lens have each of a focal length -15 cm. The mirror and lens are likely to be [NCERT] (a) both concave (b) both convex (c) mirror is concave and lens is convex (d) mirror is convex and lens is concave Answer: (a) The focal length is taken as negative for both concave mirror and concave lens.

Question 8. Under which of the following conditions, a concave mirror can form an image larger than the actual object? [NCERT Exemplar] (a) When an object is kept at a distance equal to its radius of curvature (b) When an object is kept at a distance less than its focal length (c) When an object is placed between the focus and centre of curvature (d) When an object is kept at a distance greater than its radius of curvature Answer: (c) A concave mirror can form an image enlarged, real and inverted than the actual object, beyond centre of curvature (C) when object is placed between the focus (F) and centre of curvature.

Question 13. Which of the following statement is true? [NCERT Exemplar] (a) A convex lens has 4D power having a focal length 0.25 m (b) A convex lens has 4D power having a focal length -0.25 m (c) A concave lens has 4D power having a focal length 0.25 m (d) A concave lens has 4D power having a focal length -0.25 m Answer: (a) The power P of a lens of focal length f is given by P = 1/f, where f is the focal length in metre and P is the power in dioptre. P= 1/f or f = 1/P = 1/4 = 0.25 m

Question 14. Magnification produced by a rear view mirror fitted in vehicles [NCERT Exemplar] (a) is less than one (b) is more than one (c) is equal to one (d) can be more than or less than one depending upon the position of the object in front of it. Answer: (a) The convex mirror forms virtual, erect and diminished image of the object and rear view mirror also form same type of image. Therefore, magnification (m) produced by a rear view mirror fitted in vehicles is less than one, i.e. m < 1.

Question 15. Rays from the Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed, so that size of its image is equal to the size of the object? [NCERT Exemplar] (a) 15 cm in front of the mirror (b) 30 cm in front of the mirror (c) between 15 cm and 30 cm in front of the mirror (d) more than 30 cm in front of the mirror Answer: (b) The rays from the Sun, i.e. from infinity, are parallel to principal axis after reflection converge at a point is known as focus. Therefore, focal length if) of concave mirror is 15 cm. And we know that, same size, real and inverted image is formed by concave mirror when object is placed at focus 2 A or centre of curvature, so to form same size of image, object will be placed at 15 x 2 =30 cm.

Question 17. You are given water, mustard oil, glycerine and kerosene. In which of these media, a ray of light incident obliquely at same angle would bend the most? [NCERT Exemplar] (a) Kerosene (b) Water (c) Mustard oil (d) Glycerine Answer: (d) The given material having their refractive index as kerosene is 1.44, water is 1.33, mustard oil is 1.46 and glycerine is 1.74. Thus, glycerine is most optically denser and hence have the largest refractive index. Therefore, ray of light bend most in glycerine.

Question 18. A student placed a light bulb in midway between the two plane mirrors inclined at an angle of 60°. How many images will be observed by him? (a) 4 (b) 6 (c) 5 (d) 8 Answer: (c) Number of images formed by two plane mirrors inclined at an angle 60° when a light bulb is placed in midway between them is N = 360°/60° – 1 = 6 – 1 = 5

Question 19. Where should an object be placed in front of a convex lens to get a real image of the size of the object? [NCERT] (a) At the principal focus of the lens (b) At twice the focal length (c) At infinity (d) Between the optical centre of the lens and its principal focus Answer: (b) To set the real image of the size of the object, it should be placed at twice the focal length of a convex lens.

Question 20. Which of the following lenses would you prefer to use while reading small letters found in dictionary? [NCERT] (a) A convex lens of focal length 50 cm (b) A concave lens of focal length 50 cm (c) A convex lens of focal length 5 cm (d) A concave lens of focal length 5 cm Answer: (c) Convex lens is used as magnifying glass. For better performance its focal length should be small.

NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction (Hindi Medium)

LIGHT REFLECTION & REFRACTION Form of energy produces the sensation of vision in eyes. Light (EM waves wave-length 400 nm to 750 nm). The path of light (always travel in straight line) is ray of light

Characteristics of light

• Rectilinear propagation of light
• Light travels with a speed of 3 × 10 8 m/s in air/vaccum.
• Speed of light depends on the medium
• Light shows behaviour such as reflection, refraction, interference, diffraction, polarisation etc.

Law of Refraction Refraction of light:  Bending of light ray while passing from one medium to another medium

• A ray of light bends towards the normal, while going from rarer to denser medium
• And bends away from the normal while going from denser to rarer medium
• Refraction of light takes place because the speed of light is different in the two media

Total internal Reflection :  Ray totally reflected back to denser medium Phenomena based on TIR

• Mirage – optical illusion in deserts
• Looming – optical illusion in cold countries
• Optical fibre
• Brilliance of diamond

Necessary conditions for TIR (i )  Ray of light must travel from denser to rarer medium (ii)  ∠i > ∠c for two media

Critical angle (c)  Angle i in denser medium for which angle of refraction in rarer medium is 90° μ = \(\frac{1}{\sin C}\)

Snell’s law μ = \(\frac{\sin i}{\sin r}\) For two media 1 μ 2 = \(\frac{\mu_{2}}{\mu_{1}}=\frac{\sin i}{\sin r}\)

Reflection of light:  Turning back of light in the same medium after striking the reflecting surface or mirror

• After reflection, velocity, frequency and wavelength of light remains same but intensity decreases
• If reflection takes place from denser medium then phase change ‘π’

Regular Reflection

Reflection on smooth surface.

Diffuse  Reflection Reflection on rough surface.

Laws of Reflection

The incident ray the normal and the reflected ray all lie in the same plane The angle of incidence (i) is always equal to angle of reflection (r) i.e., ∠i = ∠r

Mirror formula \(\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\) When two plane mirrors are held at an angle 9 with their reflecting surfaces facing each other and an object is placed between them, images are formed by successive reflections. . f concave = negative f convex = positive and f plane = ∞

Relation between focal length (f) and radius of curvature, R f = \(\frac{R}{2}\)

Magnification m = \(\frac{\mathrm{v}}{\mathrm{u}}=\frac{\text { height of image }}{\text { height of object }}\) m = \(\frac{f}{f-u}=\frac{f-v}{f}\)

The incident ray, the normal and the refracted ray all lie in the same plane Refractive index, μ = \(\frac{c}{v}=\frac{\text { real depth }}{\text { apparent depth }}\)

Plane Mirror

Is a looking glass, highly polished on one surface.

• Forms virtual and erect image
• Distance of object from mirror = distance of image from mirror.
• The size of the image is same as object.
• Image is laterally inverted.
• Used in kaleidoscope periscope, etc.

Concave Mirror Spherical glass polished on the outside. It is also known as a converging mirror.

• Images produced are always real, inverted, can be enlarged based on the position except when object is placed between pole and focus.
• Uses: Make-up and shaving mirrors, dentist mirror, in floodlight etc.

Image formation by a convex mirror for different positions of the object

Convex Mirror Spherical glass polished inside. It is also known as diverging mirror.

• It forms virtual, upright and small images.
• Uses: for security’ purposes, in vehicles as rear- view mirror and street lighting.

Image formation by a concave mirror for different positions of the object

Atmospheric Refraction

Earth’s atmosphere is thin at the top and dense at the bottom, thus leads to refraction of light, μ = c/v

• Twinkling of stars
• Advanced sunrise and delayed sunset

Refraction Through a Glass Slab x = \(\frac{t \sin (i-r)}{\cos r}\) ∴ x ∝ μ

Power of a lens

P = \(\frac{1}{f(\text { in metre })}\) Unit of power of lens is diopter (D) P convex → Positive P concave → Negative and P plane → Zero

Lens Piece of transparent material with two refracting surfaces, at least one is curved and refractive index should different as that of the surrounding.

Lens formula \(\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\) f convex → negative f concave → positive and f plane → ∞

Concave Lens Cental portion of lens is thinner than marginal. It as also known as diverging lens.

Convex Lens Central portion of lens is thicker than marginal. It is also known us converging lens.

Magnification Ratio of distance of image to the distance of object from the optical centre. Also equal to height of image to the height of object m = \(\frac{\mathrm{I}}{\mathrm{o}}=\frac{\mathrm{v}}{\mathrm{u}}=\frac{\mathrm{h}_{\mathrm{I}}}{\mathrm{h}_{\mathrm{o}}}\)

Nature, position and relative size of the image formed by a concave lens for various position of the object

Nature, position and relative size of the image formed by a convex lens for various positions of the object

Now that you are provided all the necessary information regarding NCERT Solutions For Class 10 Science Chapter 10 Light Reflection and Refraction  and we hope this detailed article on light reflection and refraction class 10 NCERT solutions is helpful. If you have any questions related to this article, kindly ask your questions through the comment section below and we will get back to you as soon as possible.

NCERT Solutions for Class 10 Science All Chapters

• Chapter 1 Chemical Reactions and Equations
• Chapter 2 Acids, Bases and Salts
• Chapter 3 Metals and Non-metals
• Chapter 4 Carbon and Its Compounds
• Chapter 5 Periodic Classification of Elements
• Chapter 6 Life Processes
• Chapter 7 Control and Coordination
• Chapter 8 How do Organisms Reproduce?
• Chapter 9 Heredity and Evolution
• Chapter 10 Light Reflection and Refraction
• Chapter 11 Human Eye and Colourful World
• Chapter 12 Electricity
• Chapter 13 Magnetic Effects of Electric Current
• Chapter 14 Sources of Energy
• Chapter 15 Our Environment
• Chapter 16 Management of Natural Resources

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CBSE Class 10 Science Chapter Wise Important Case Study Questions

Chapter wise important case study questions cbse class 10 science: cbse class 10 science board exam 2024 is just around the corner and students are working hard to score maximum marks. check these case study questions from class 10 science to ace your examination this year also download the solutions from the pdf attached towards the end. .

CBSE Class 10 Science Chapter Wise Important Case Study Questions: While the CBSE Board exam for Class 10 students are ongoing, the CBSE Class 10 Science board exam 2024 is to be held on March 2, 2024. With the exams just a  few days away, CBSE Class 10th Board exam candidates are rushing to prepare the remaining syllabus, practising their weak portions, trying to revise the important questions from the past year papers, practise questions, etc. 

Why are CBSE Class 10 Science Case Study Questions Important?

• Section A : 20 Multiple Choice Questions (MCQs) carrying 1 mark each.  
• Section B : 6 Very Short Answer type questions carrying 2 marks each. Answers to these questions should be in the range of 30 to 50 words.  
• Section C : 7 Short Answer type questions carrying 3 marks each. Answers to these questions should be in the range of 50 to 80 words.  
• Section D : 3 Long Answer type questions carrying 5 marks each. Answers to these questions should be in the range of 80 to 120 words.
• Section E : 3 Case Based/ Source Based units of assessment (4 marks each) with sub-parts.  

How to solve case study questions in CBSE Class 10 Science?

• Read the case given and the associated questions carefully.
• Read the questions attentively and analyse what they are asking.
• Apply your subject knowledge and theories in the given case to decide what the correct answers should be.

1.A chemical reaction is a representation of chemical change in terms of symbols and formulae of reactants and products. There are various types of chemical reactions like combination, decomposition, displacement, double displacement, oxidation and reduction reactions. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. All combustion reactions are exothermic reactions.

(i) The massive force that pushes the rocket forward through space is generated due to the

(a) combination reaction

(b) decomposition reaction

(c) displacement reaction

(d) double displacement reaction

(ii) A white salt on heating decomposes to give brown fumes and yellow residue is left behind. The yellow residue left is of

(a) lead nitrate

(b) nitrogen oxide

(c) lead oxide

(d) oxygen gas

(iii) Which of the following reactions represents a combination reaction?

(a) CaO (s) + H2O (l) → Ca (OH)2 (aq)

(b) CaCO3 (s) → CaO (s) + CO2(g)

(c) Zn(s) + CuSO4 (aq) → ZnSO4 (aq) + Cu(s)

(d) 2FeSO4(s) → Fe2O3 (s) +SO2(g) + SO3(g)

(iv) Complete the following statements by choosing correct type of reaction for X and Y.

Statement 1: The heating of lead nitrate is an example of ‘X’ reaction.

Statement 2: The burning of magnesium is an example of ‘Y’ reaction.

(a)X-Combination,Y-Decomposition

(b)X-Decomposition,Y-Combination

(c)X-Combination,Y-Displacement

(d) X- Displacement, Y-Decomposition

2.The earlier concept of oxidation and reduction is based on the addition or removal of oxygen or hydrogen elements so, in terms of oxygen and hydrogen, oxidation is addition of oxygen to a substance and removal of hydrogen from a substance. On the other hand, reduction is addition of hydrogen to a substance and removal of oxygen from a substance. The substance which gives oxygen to another substance or removes hydrogen from another substance in an oxidation reaction is known as oxidising agent, while the substance which gives hydrogen to another substance or removes oxygen from another substance in a reduction reaction is known as reducing agent. For example, 

(i) A redox reaction is one in which

(a) both the substances are reduced

(b) both the substances are oxidised

(c) an acid is neutralised by the base

(d) one substance is oxidised while the other is reduced.

(ii) In the reaction, H2S+Cl2⟶S+2HCl

(a) H2S is the reducing agent. 

(b) HCl is the oxidising agent.

(c) H2S is the oxidising agent. 

(d) Cl2 is the reducing agent.

(iii) Which of the following processes does not involve either oxidation or reduction?

(a) Formation of slaked lime from quicklime.

(b) Heating mercuric oxide.

(c) Formation of manganese chloride from manganese oxide (MnO2).

(d) Formation of zinc from zinc blende.

(iv) Mg+CuO⟶MgO+Cu

Which of the following is wrong relating to the above reaction?

(a) CuO gets reduced

(b) Mg gets oxidised.

(c) CuO gets oxidised. 

(d) It is a redox reaction.

3.A copper vessel gets tarnished due to formation of an oxide layer on its surface. On rubbing lemon on the vessel, the surface is cleaned, and the vessel begins to shine again. This is due to the fact that which reacts with the acid present in lemon to form a salt which is washed away with water. As a result, the layer of copper oxide is removed from the surface of the vessel and the shining surface is exposed.

1.Which of the following acids is present in lemon?

(a) Formic acid

(b) Acetic acid

(c) Citric acid

(d) Hydrochloric acid

2.The nature of copper oxide is

d) amphoteric

3.Name the salt formed in the above reaction

a) copper carbonate

b) copper chloride

c)copper citrate

d) copper citrate

4.The phenomenon of copper getting tarnished is

a) corrosion

b) rancidity

c) displacement

d)none of these

4.Metals as we know, are very useful in all fields, industries in particular. Non-metals are no less in any way. Oxygen present in air is essential for breathing as well as for combustion. Non-metals form a large number of compounds which are extremely useful, e.g., ammonia, nitric acid, sulphuric acid, etc. Non-metals are found to exist in three states of matter. Only solid non-metals are expected to be hard however, they have low density and are brittle. They usually have low melting and boiling points and are poor conductors of electricity.

i.____________ is a non-metal but is lustrous

A.Phosphorus

ii.Which of the following is known as 'King of chemicals'?

C. Sulphuric acid

D. Nitric acid

iii.Which of the following non-metals is a liquid?

iv.Hydrogen is used

A.for the synthesis of ammonia

B. for the synthesis of methyl alcohol

C.nitrogenous fertilizers

D. all of these

5.Nisha observed that the bottoms of cooking utensils were turning black in colour while the flame of her stove was yellow in colour. Her daughter suggested cleaning the air holes of the stove to get a clean, blue flame. She also told her mother that this would prevent the fuel from getting wasted.

a) Identify the reasons behind the sooty flame arising from the stove.

b) Can you distinguish between saturated and unsaturated compounds by burning them? Justify your answer.

c) Why do you think the colour of the flame turns blue once the air holes of the stove are cleaned?

6.Blood transport food, Oxygen and waste materials in our bodies. It consists of plasma as a fluid medium. A pumping organ [heart] is required to push the blood around the body. The blood flows through the chambers of the heart in a specific manner and direction. While flowing throughout the body, blood exerts a pressure against the wall or a vessel.

• Pulmonary artery
• Pulmonary vein
• Very narrow and have high resistance
• Much wide and have low resistance
• Very narrow and have low resistance
• Much wide and have high resistance
• It is a hollow muscular organ
• It is four chambered having three auricles and one ventricle.
• It has different chambers to prevent O2 rich blood from mixing with the blood containing CO2
• Both A & C
• Blood = Plasma + RBC + WBC + Platelets
• Plasma = Blood – RBC
• Lymph = Plasma + RBC
• Serum = Plasma + RBC + WBC

7.A brain is displayed at the Allen Institute for Brain Science. The human brain is a 3-pound (1.4-kilogram) mass of jelly-like fats and tissues—yet it's the most complex of all known living structures The human brain is more complex than any other known structure in the universe. Weighing in at three pounds, on average, this spongy mass of fat and protein is made up of two overarching types of cells—called glia and neurons— and it contains many billions of each. Neurons are notable for their branch-like projections called axons and dendrites, which gather and transmit electrochemical signals. Different types of glial cells provide physical protection to neurons and help keep them, and the brain, healthy. Together, this complex network of cells gives rise to every aspect of our shared humanity. We could not breathe, play, love, or remember without the brain.

1)Animals such as elephants, dolphins, and whales actually have larger brains, but humans have the most developed cerebrum. It's packed to capacity inside our skulls and is highly folded. Why our brain is highly folded?

• b) Learning

3)Which among these protects our brain?

a)Neurotransmitter

b) Cerebrospinal fluid

d) Grey matter

4.Ram was studying in his room. Suddenly he smells something burning and sees smoke in the room. He rushes out of the room immediately. Was Ram’s action voluntary or involuntary? Why?

8.Preeti is very fond of gardening. She has different flowering plants in her garden. One day a few naughty children entered her garden and plucked many leaves of Bryophyllum plant and threw them here and there in the garden. After few days, Preeti observed that new Bryophyllum plants were coming out from the leaves which fell on the ground.

1.What does the incident sited in the paragraph indicate?

(a). Bryophyllum leaves have special buds that germinate to give rise to new plant.

(b). Bryophyllum can propagate vegetatively through leaves.

(c). Bryophyllum is a flowering plant that reproduces only asexually

(d). Both (a) and (b).

2.Which of the following plants can propagate vegetatively through leaves like Bryophyllum?

3.Do you think any other vegetative part of Bryophyllum can help in propagation? If yes, then which part?

(c) Flowers

4.Which of the following plant is artificially propagated (vegetatively) by stem cuttings in horticultural practices?

(b)Snakeplant

(d)Water hyacinth

9.The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of the population.

1) What are common signs of sexual maturation in boys?

a) Broadening of shoulders

b) Development of mammary glands

c) Broadening of waist

d) High pitch of voice

2) Common sign of sexual maturation in girls is

a) Low pitch voice

b) Appearance of moustache and beard

c) Development of mammary glands

d) Broadening of shoulders

3) Which contraceptive method changes the hormonal balance of the body?

b) Diaphragms

c) Oral pills

d) Both a) and b)

4) What should be maintained for healthy society?

a) Rate of birth and death rate

b) Male and female sex ratio

c) Child sex ratio

d) None of these

10.Pea plants can have smooth seeds or wrinkled seeds. One of the phenotypes is completely dominant over the other. A farmer decides to pollinate one flower of a plant with smooth seeds using pollen from a plant with wrinkled seeds. The resulting pea pod has all smooth seeds.

i) Which of the following conclusions can be drawn?

(1) The allele for smooth seeds is dominated over that of wrinkled seeds.

(2) The plant with smooth seeds is heterozygous.

(3) The plant with wrinkled seeds is homozygous.

(b) 1 and 2 only

(c) 1 and 3 only

(d) 1, 2 and 3

ii) Which of the following crosses will give smooth and wrinkled seeds in same proportion?

(a) RR X rr

(b) Rr X rr

(d) rr X rr

iii) Which of the following cross can be used to determine the genotype of a plant with dominant phenotype?

(a) RR X RR

(b) Rr X Rr

(c) Rr X RR

(d) RR X rr

iv) On crossing of two heterozygous smooth seeded plants (Rr), a total of 1000 plants were obtained in F1 generation. What will be the respective number of smooth and wrinkled seeds obtained in F1 generation?

(a) 750, 250

(b) 500, 500

(C) 800, 200

(d) 950, 50

11.Food chains are very important for the survival of most species.When only one element is removed from the food chain it can result in extinction of a species in some cases.The foundation of the food chain consists of primary producers.Primary producers or autotrophs,can use either solar energy or chemical energy to create complex organic compounds,whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun’s light is necessary for photosynthesis,most life could not exist if the sun disappeared.Even so,it has recently been discovered that there are some forms of life,chemotrophs,that appear to gain all their metabolic energy from chemosynthesis driven by hydrothermal vents,thus showing that some life may not require solar energy to thrive.

1.If 10,000 J solar energy falls on green plants in a terrestrial ecosystem,what percentage of solar energy will be converted into food energy?

(d)It will depend on the type of the terrestrial plant

2.Matter and energy are two fundamental inputs of an ecosystem. Movement of

(a)Energy is by directional and matter is repeatedly circulating

(b)Energy is repeatedly circulating and matter is unidirectional

(c)Energy is unidirectional and matter is repeatedly circulating

(d)Energy is multidirectional and matter is bidirectional

3.Raj is eating curd/yoghurt. For this food intake in a food chain he should be considered as occupying

(a)First trophic level

(b)Second trophic level

(c)Third trophic level

(d)Fourth trophic level

4.Which of the following, limits the number of trophic levels in a food chain

(a)Decrease in energy at higher trophic levels

(b)Less availability of food

(c)Polluted air

5.The decomposers are not included in the food chain. The correct reason for the same is because decomposers

(a) Act at every trophic level at the food chain

(b) Do not breakdown organic compounds

(c) Convert organic material to inorganic forms

(d) Release enzymes outside their body to convert organic material to inorganic forms

12.Shyam participated in a group discussion in his inter school competition on the practical application of light and was very happy to win an award for his school. That very evening his father gave treat to celebrate Shyam’s win. Shyam while sitting saw an image of a person sitting at his backside in his curved plate and could see that person’s mobile drop in the flower bed. Person was not aware until Shyam went and informed him. He thanked Shyam for his clever move.

a)From which side of his plate Shyam observed the incident –

i)outward curved

ii)inward curved

iii)plane surface

b)Part of plate from which Shyam observed the incident acted like a-

i)concave mirror

ii)convex mirror

iii)plane mirror

c)The nature of the size of the image formed in above situation is –

i)real, inverted and magnified

ii)same size , laterally inverted

iii)virtual, erect and diminished

iv)real , inverted and diminished

d)Magnification of the image formed by convex mirror is –

more than 1

iii)equal to 1

iv)less than 1

• The location of image formed by a convex lens when the object is placed at infinity is

(a) at focus

(c) at optical center

• When the object is placed at the focus of concave lens, the image formed is

(a)real and smaller

(b) virtual and smaller

(c) virtual and inverted

• The size of image formed by a convex lens when the object is placed at the focus ofconvex lens is

(a) highly magnified

(b) point in size

• When the object is placed at 2F in front of convex lens, the location of image is

(b) between F and optical center

(c) at infinity

(d) none of the above

14.One of the wires in domestic circuits supply, usually with a red insulation cover, is called live wire. with black insulation is called neutral wire. The earth wire, which has insulation of green colour, is usually connected to a metal plate deep in the earth near the house appliances that has a metallic body. Overloading contact, in such a situation the current in the circuit abruptly increases. circuit prevents damage to the appliances and the circuit due to overloading.

1 When do we say that an electrical appliance

2 Mention the function of earth wire in electrical line

3 How is an electric fuse connected in a domestic circuit?

4 When overloading and short circuiting are said to occur?

5 What is a live wire?

15.Light of all the colours travel at the same speed in vacuum for all wavelengths. But in any transparent medium(glass or water), the light of different colours travels at different speeds for different wavelengths, which means that the refractive index of a particular medium is different for different wavelengths. As there is a difference in their speeds, the light of different colours bend through different angles. The speed of violet colour is maximum and the speed of red colour is minimum in glass so, the red light deviates least and violet colour deviates most. Hence, higher the wavelength of a colour of light, smaller the refractive index and less is the bending of light.

(i)Which of the following statements is correct regarding the propagation of Light of different colours of white light in air?

(a) Red light moves fastest.

(b) Blue light moves faster than green light.

(c) All the colours of the white light move with the same speed.

(d) Yellow light moves with the mean speed as that of the red and the violet light.

(ii)Which of the following is the correct order of wavelength?

(a) Red> Green> Yellow

(b) Red> Violet> Green

(c) Yellow> Green> Violet

(d) Red> Yellow> Orange

(iii)Which of the following is the correct order of speed of light in glass?

(a) Red> Green> Blue

(b) Blue> Green> Red

(c) Violet> Red> Green

(d) Green> Red> Blue

(iv)Which colour has maximum frequency?

16.The region around a magnet where magnetism acts is represented by the magnetic field.The force of magnetism is due to moving charge or some magnetic material. Like stationary charges produce an electric field proportional to the magnitude of charge, moving charges produce magnetic fields proportional to the current. In other words, a current carrying conductor produces a magnetic field around it. The subatomic particles in the conductor, like the electrons moving in atomic orbitals, are responsible for the production of magnetic fields. The magnetic field lines around a straight conductor (straight wire) carrying current are concentric circles whose centres lie on the wire.

1)The magnetic field associated with a current carrying straight conductor is in anti- clockwise direction. If the conductor was held horizontally along east west direction,what is the direction of current through it?

2)Name and state the rule applied to determine the direction of magnetic field in a straight current carrying conductor.

3)Ramus performs an experiment to study the magnetic effect of current around a current carrying straight conductor with the help of a magnetic compass. He reports that

a)The degree of deflection of magnetic compass increases when the compass is moved away from the conductor.

b)The degree of deflection of the magnetic compass increases when the current through the conductor is increased.

Which of the above observations of the student appears to be wrong and why?

Case Study Questions Class 10 Science CBSE Chapter Wise PDF

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CBSE 10th Standard Science Subject Light Reflection and Refraction Chapter Case Study Questions 2021

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Cbse 10th standard science subject light reflection and refraction case study questions 2021.

10th Standard CBSE

Final Semester - June 2015

The refraction oflight on going from one medium to another takes place according to two laws which are known as the laws of refraction of light. These laws are 1. The ratio of sine of angle of incidence to the sine of angle of refraction is always constant for the pair of media in contact. \(\frac{\sin i}{\sin r}=\mu=\text { constant }\) This constant is called refractive index of the second medium with respect to the first medium. Refractive index is also defined as the ratio of speed of light in vacuum to the speed of light in medium. 2. The incident ray, refracted ray and normal all lie in the same plane. This law is called Snell's law of refraction. (i) When light travels from air to glass, (a) angle of incidence > angle of refraction (b) angle of incidence < angle of refraction (c) angle of incidence = angle of refraction (d) can't say (ii) When light travels from air to medium, the angle of incidence is 45° and angle of refraction is 30°. The refractive index of second medium with respect to the first medium is 

(iii) In which medium, the speed of light is minimum?

(iv) If the refractive index of glass is 1.5 and speed of light in air is 3 x 10 8 m/s. The speed of light in glass is

(v) Refractive index of a with respect to b is 2. Find the refractive index of b with respect to a.

(v) A water drop acts as a

The lenses forms different types of images when object placed at different locations. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.When a ray goes through the optical centre of the lens, it passes without any deviation. If the object is placed between focus and optical center of the convex lens, erect and magnified image is formed. As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also the size of image goes on increasing and the image is always real and inverted. A concave lens always gives a virtual, erect and diminished image irrespective to the position of the object. (i) The location of image formed by a convex lens when the object is placed at infinity is

(ii) When the object is placed at the focus of concave lens, the image formed is

(iii) The size of image formed by a convex lens when the object is placed at the focus of convex lens is

(iv) When the object is placed at 2F in front of convex lens, the location of image is

The relationship between the distance of object from the lens (u), distance of image from the lens (v) and the focal length (j) of the lens is called lens formula. It can be written as \(\begin{equation} \frac{1}{f}=\frac{1}{v}-\frac{1}{u} \end{equation}\) The size of image formed by a lens depends on the position of the object from the lens. A lens of short focal length has more power whereas a lens of long focal length has less power. When the lens is convex, the power is positive and for concave lens, the power is negative. The magnification produced by a lens is the ratio of height of image to the height of object as the size of the image relative to the object is given by linear magnification (m). When, m is negative, image formed is real and when m is positive, image formed is virtual. If m < 1, size of image is smaller than the object. If m > 1, size of image is larger than the object. (i) An object 4 cm in height is placed at a distance of 10 cm from a convex lens of focal length 20 cm. The position of image is

(ii) In the above question, the size of image is

(iii) An object is ,placed 50 cm from a concave lens and produces a virtual image at a distance of 10 cm infrontof lens. The focal length of lens is

(iv) A convex lens forms an image of magnification -2 of the height of image is 6 cm, the height of object is

(v) A concave lens offocallength 5 ern, the power oflens is

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CBSE Class 10 Important Questions on Science Chapter 10 - Light Reflection and Refraction 2024-25

• Class 10 Important Question
• Chapter 10: Light Reflection And Refraction

CBSE Class 10 Science Chapter-10 Important Questions with Answers - Free PDF Download

The concept of light, reflection, and refraction is quite fascinating for the students of Class 10. In the previous classes, students have learned a lot of new things related to these two natural phenomena occurring with light. In Class 10, they will advance to a new level of concepts related to reflection and refraction. The textbook explains the concepts pretty well. Students will need more Light Reflection and Refraction Class 10 Important Questions with answers to prepare for the exams.

By studying the Class 10 Science Chapter 10 Important Questions, you will develop your concept for this chapter in a better way. In fact, your answering skills will also increase considerably. Check out how the expert teachers at Vedantu have answered the Light Class 10 Important Questions niftily. Download the PDF and follow the format of answering questions as shown by the experts to score more. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for the better solutions, they can download Class 10 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.

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Related Chapters

Important Topics under CBSE Class 10 Science Chapter 10 - Light Reflection and Refraction

The following list of important topics covered under the chapter on Light Reflection and Refraction has been provided for students so that they can take a glance at the major concepts and read them through before diving into the important questions.

Reflection of Light

Spherical Mirrors

Image Formation by Spherical Mirrors

Sign Convention for Spherical Mirrors

Mirror Formula and Magnification

Refraction of Light

Refraction through a Rectangular Glass Slab

Refractive Index

Refraction by Spherical Lenses

Image Formation by Lenses and Their Ray Diagrams

Sign Convention for Spherical Lenses

Lens Formula and Magnification

Power of a Lens

Study Important Questions for Class 10 Science Chapter 10 - Light Reflection and Refraction

Long Answer Questions (5 Marks)

1. A convex lens has a focal length of \[10\] cm. At what distance from the lens should the object be placed so that it forms a real and inverted image $20$ cm. away from the lens? What would be the size of the image formed if the object is $2$ cm high? With the help of a ray, the diagram shows the formation of the image by the lens in this case?

Ans: Given, the focal length of the convex lens,

$\Rightarrow f=+10$ cm

Also, given the image formed is real and inverted with the image distance as $20$ cm.

$\Rightarrow v=+20$ cm

From the lens formula, we have: 

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{10}=\dfrac{1}{20}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{u}=\dfrac{1}{20}-\dfrac{1}{10}$

$\Rightarrow \dfrac{1}{u}=\dfrac{-1}{20}$

$\Rightarrow u=-20$ cm.

$\therefore $ The object is placed at a distance of $20$ cm.

Magnification is given as,

$\Rightarrow m=-\dfrac{v}{u}$

$\Rightarrow m=-\dfrac{20}{\left( -20 \right)}$

$\Rightarrow m=+1$

Also, magnification is given by, $m=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}$.

$\therefore m=\dfrac{Height\text{ of the image}}{2}$

$\Rightarrow 1=\dfrac{Height\text{ of the image}}{2}$

$\Rightarrow Height\text{ of the image}=2$ cm.

Thus, the image is of the same size as that of the object and it is real and inverted.

The ray diagram representing the formation of the image by the lens in this case is:

It is observed that the image is formed at $2{F_2}$ with the object placed at $2{F_1}$.

2. Draw a ray diagram to show the use of a convex lens for the formation of images having the following characteristics. 

a. Real & inverted and diminished 

Ans: A ray diagram representing a real & inverted and diminished image is given below.

b. Virtual, erect & magnified.

Ans: A ray diagram representing a virtual, erect, and magnified image is given below.

3. A convex lens forms a real and inverted image of a needle at a distance of $50$ cm. from it. Where is the needle placed in front of the convex lens if the image is equal to the size of objects? Also, find the power of the lens.

Ans: Given, the image is real and inverted at a distance of $50$ cm.

$\Rightarrow v=+50$ cm

Also given, Height of image $=$ Height of object

We know, magnification is given as,

$\therefore -\dfrac{v}{u}=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}$

Since, Height of image $=$ Height of object and $v=+50$ cm

$\Rightarrow -\dfrac{50}{u}=1$

$\Rightarrow u=-50$ cm

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{50}-\dfrac{1}{-50}$

$\Rightarrow f=25$ cm

$\Rightarrow f=0.25$ m

The power of a lens is given by,

$\Rightarrow P=\dfrac{1}{f}$

$\Rightarrow P=\dfrac{1}{0.25}$  m

$\Rightarrow P=+4$ D

4. One-half of a convex lens is covered with black paper. Will this lens produce a complete image of the object? Verify your answers experimentally. Explain your observations.

Ans: If we cover one-half of a convex lens with black paper it is observed that it produces a complete image of the object.

Representing the given situation with a ray diagram.

Adjust the position of the burning candle such that its image is formed on the screen placed on the other side of the lens.

We get a full image of the burning candle on the screen.

Thus, from the above observation, we conclude that the formation of an image does not depend on the length of the lens, but the brightness of the image formed on the screen depends since the number of rays passing through the lens gets reduced on covering half the lens with black paper.

5. An object $5$ cm in length is held $25$ cm away from a converging lens of focal length $10$ cm. Draw the ray diagram and find the position, size, and nature of the image formed.

Ans: Given focal length of the lens, $f=+10$ cm.

Object distance from the converging lens is given to be $25$ cm and the height of the object ($ho$) is given to be $5$ cm.

$\Rightarrow u=-25$ cm

$\Rightarrow ho=5$ cm

$\Rightarrow \dfrac{1}{10}=\dfrac{1}{v}-\dfrac{1}{-25}$

$\Rightarrow \dfrac{1}{v}=\dfrac{1}{25}-\dfrac{1}{10}$

$\Rightarrow v=\dfrac{50}{3}$ cm

$\Rightarrow v=16.7$ cm

Thus, we conclude that the image formed is real and inverted and is formed at a distance of $16.7$ cm on the other side of the lens.

Also, magnification is given by, $m=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}=\dfrac{hi}{ho}$.

$\therefore -\dfrac{v}{u}=\dfrac{hi}{ho}$

$\Rightarrow \dfrac{16.7}{-25}=\dfrac{hi}{5}$

$\Rightarrow hi=-\dfrac{10}{3}$ cm

Hence, the image is diminished.

The ray diagram representing the above situation is drawn below.

6. A convex lens of focal length $15$ cm formed an image $10$ cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

Ans: Given focal length of the lens, $f=15$ cm.

Image distance from the converging lens is given to be $10$ cm.

$\Rightarrow v=-10$ cm

We observe that the image distance is less than the focal length, hence the image formed would be virtual and erect.

$\Rightarrow \dfrac{1}{15}=\dfrac{1}{-10}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{u}=-\dfrac{1}{10}-\dfrac{1}{15}$

$\Rightarrow u=-6$ cm

Light: Reflection and Refraction - Important Questions and Solutions Summary

light rays, mirrors, lenses, prisms, etc., is the advanced version of what you As mentioned earlier, the chapter related to light, reflection, and refraction of have studied in the previous classes. In Class 10, you will have to focus on the theoretical part, as well as, the use of these theories to answer questions.

After you have completed answering the basic questions in the exercise, you might need a question bank to learn more about this chapter. This is where Light Reflection and Refraction Class 10 Important Questions with Answers can be used perfectly. These questions will intellectually challenge your knowledge and foundation of concepts based on this topic. You can answer on your own and check whether you know the right answer or not.

Class 10 Light Reflection and Refraction Important Questions have been developed by the expert teachers to provide a strong idea of how questions are set in the exams. All these questions are developed to define how theoretical concepts are used to solve conceptual problems. You will gain a better insight into the chapters and strengthen your foundation accordingly.

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The Important Questions for Class 10 Light Reflection and Refraction have been developed based on the basic and advanced concepts you have learned in your science textbook. Let us check the benefits of studying these questions first.

Thinking Out of the Box

The Important Questions of Light Reflection and Refraction Class 10 is the ultimate suggestion for the upcoming board exam. You can study these questions, prepare their answers on your own, and compare them with the solution provided. This will help you to understand how efficiently you have studied the chapter. Light Class 10 Important Questions have been developed to help you think out of the box. In most cases, the thoughts of the students remain stuck in the exercises of the textbook. These questions will help them think out of the box and challenge their intellect.

Getting to Know Possible Important Questions of Chapter 10 Class 10 Science

By studying Class 10th Science Chapter 10 Important Questions , you will get to know possible questions that might come in the board exams. All these questions are developed by experienced science teachers. They are well-aware of the type of questions asked in the CBSE exam . Hence, studying these questions will help you learn about different modes and patterns.

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The Important Questions for Class 10 Science Light Reflection and Refraction have simple explanations. All the concepts in this chapter will be exceptionally simplified and utilized to answer these important questions. Hence, the students will get another way to learn how to use the textbook concepts to solve challenging questions in the exams.

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This chapter poses a challenge in the form of numerical questions related to mirrors and lenses. These problems are based on a set of formulas related to the focal distance, object distance, and image distance of lenses and mirrors. By using Class 10 Science Chapter 10 Important Questions and Solutions, you can master using the formula in different aspects without committing mistakes.

You can download Chapter 10 Science Class 10 Important Questions and solutions in PDF format and study them offline. Get this extra set of questions and use them as a reference to clear your concepts of this crucial chapter.

Important Related Links for CBSE Class 10 Science

FAQs on CBSE Class 10 Important Questions on Science Chapter 10 - Light Reflection and Refraction 2024-25

1. Why Should You Prefer Vedantu for Important Questions of Light Class 10?

The teachers of Vedantu have formulated the best possible questions of Class 10 Light for the students to follow. The answers are simple and follow the CBSE guidelines. You can rest be assured that you will get the best-quality questions and answers to study.

2. Why Should You Study Light Reflection and Refraction Important Questions?

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3. What are the important topics covered in the CBSE Class 10 Science Chapter 10 - Light Reflection and Refraction?

The following are the important topics covered in the Chapter on Light Reflection and Refraction: 

CBSE Class 10 Science Important Questions

Cbse study materials.

• NCERT Exemplar
• Science Exemplar Class 10
• Light Reflection And Refraction

NCERT Exemplar Class 10 Science Solutions for Chapter 10 - Light Reflection and Refraction

Ncert exemplar solutions class 10 science chapter 10 – free pdf download.

NCERT Exemplar Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction will boost your confidence in attempting the board exam by providing you with different types of questions that can be asked on the topic of Reflection and Refraction. In Chapter 10, students will understand the phenomena of reflection and refraction of light, and at the same time, they will learn about the basic concepts related to some optical phenomena occurring in nature. Students will also understand the reflection of light by spherical mirrors and refraction of light and other concepts like the mirror formula, refractive index, lens formula and more.

We are providing free NCERT Exemplar Solutions for Class 10 Science Chapter 10 here for the students to practise well and obtain good marks in the board exam. These exemplars will facilitate easy learning, and students will be able to get clarity on all the concepts and topics given in this chapter. Besides, these Exemplar Solutions that are given here act as a very useful reference tool which will help them get familiar with all the important chapter topics, practice questions, complete revisions, and ultimately, be well prepared to write the final exams.

Students can take a quick look at Class 10 Science Chapter 10 NCERT Exemplar by downloading the solutions PDF from the link below.

Download the PDF of NCERT Exemplar for Class 10 Science Chapter 10 – Light Reflection and Refraction

Access Answers to NCERT Exemplar Class 10 Science Chapter 10 – Light Reflection and Refraction

Multiple-choice questions.

1. Which of the following can make a parallel beam of light when light from a point source is incident on it?

(a) Concave mirror as well as convex lens

(b) Convex mirror as well as a concave lens

(c) Two plane mirrors placed at 90° to each other

(d) Concave mirror as well as a concave lens

The answer is (a) Concave mirror as well as convex lens

Explanation:

Emergent beams are parallel, and the image is produced at infinity when light rays from a point source are incident on a concave mirror and convex lens.

2. A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is

(a) – 30 cm

(b) – 20 cm

(c) – 40 cm

(d) – 60 cm

The answer is (b) – 20 cm

Here, size of object = O = + 10.0 mm = + 1.0 cm (as, 1 cm = 10 mm)

Size of Image size = I = 5.0 mm = 0.5 cm

Image distance, v = − 30 cm  (as the image is real)

Let, object distance = u

Focal length, f =?

Magnification m= I(size of image)/O(size of image)

Magnification is given by m= -v/u

0.5/1=-30/u

Focal length is given by 1/f =1/v + 1/u

1/f=1/-30 + 1/60

3. Under which of the following conditions a concave mirror can form an image larger than the actual object?

(a) When the object is kept at a distance equal to its radius of curvature

(b) When an object is kept at a distance less than its focal length

(c) When an object is placed between the focus and centre of curvature

(d) When an object is kept at a distance greater than its radius of curvature

The answer is (c) When an object is placed between the focus and centre of curvature

When an object is placed between F and C, an enlarged image is formed beyond C.

4. Figure 10.1 shows a ray of light as it travels from medium A to medium B. Refractive index of the

medium B relative to medium A is

(a) √3 / √2

The answer is (a) 3 / 2

Refractive Index of B with respect to A

=sin i/sin r

=sin60/sin45

= ( √3 /2) /(1/ √2)

5. A light ray enters from medium A to medium B, as shown in Figure 10.2. The refractive

index of medium B relative to A will be

(a) greater than unity

(b) less than unity

(c) equal to unity

The answer is (a) greater than unity

6. Beams of light are incident through holes A and B and emerge out of the box through holes C and D, respectively, as shown in the Figure10.3. Which of the following could be inside the box?

(a) A rectangular glass slab

(b) A convex lens

(c) A concave lens

(d) A prism

The answer is (a) A rectangular glass slab

When incident rays fall perpendicularly on the point of incidence. A rectangular glass slab would refract and then re-refract it.

7. A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box, as shown in Figure 10.4. Which of the following could be inside the box?

(a) Concave lens

(b) Rectangular glass slab

(d) Convex lens

The answer is (d) Convex lens

Convex lenses are converging lenses. They have the ability to converge a parallel beam of light into a point.

8. Which of the following statements is true?

(a) A convex lens has 4 dioptre power having a focal length 0.25 m

(b) A convex lens has –4 dioptre power having a focal length 0.25 m

(c) A concave lens has 4 dioptre power having a focal length 0.25 m

(d) A concave lens has –4 dioptre power having a focal length 0.25 m

The answer is (a) A convex lens has 4 dioptre power having a focal length 0.25 m

A positive value for focal length indicates a convex lens.

9. Magnification produced by a rearview mirror fitted in vehicles

(a) is less than one

(b) is more than one

(c) is equal to one

(d) can be more than or less than one, depending upon the position of the object in front of it

The answer is (a) is less than one

A Convex mirror is used in the rearview mirror. The convex mirror always gives a smaller image. Hence, the magnification produced by the rear view mirror is always less than 1.

10. Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed, so that size of its image is equal to the size of the object?

(a) 15 cm in front of the mirror

(b) 30 cm in front of the mirror

(c) between 15 cm and 30 cm in front of the mirror

(d) more than 30 cm in front of the mirror

The answer is (d) more than 30 cm in front of the mirror

Here f= 15,

The radius of curvature is double the focal length

When an object is placed on c, its image is of the same size, inverted and is formed on c.

11. A full-length image of a distant tall building can definitely be seen by using

(a) a concave mirror

(b) a convex mirror

(c) a plane mirror

(d) both concave as well as plane mirror

The answer is (b) a convex mirror

The field of a convex mirror is more than any type of mirror. Hence the full-length size of the building can be seen by using a convex mirror.

12. In torches, searchlights and headlights of vehicles, the bulb is placed

(a) between the pole and the focus of the reflector

(b) very near to the focus of the reflector

(c) between the focus and centre of curvature of the reflector

(d) at the centre of curvature of the reflector

The answer is (b) very near to the focus of the reflector

Headlight reflectors and searchlights are in the shape of a concave mirror. When the source of light is placed at the focus, reflected light appears like a beam.

13. The laws of reflection hold good for

(a) plane mirror only

(b) concave mirror only

(c) convex mirror only

(d) all mirrors, irrespective of their shape

The answer is (d) all mirrors, irrespective of their shape

14. The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in Figure 10.5. Which one of them is correct?

The answer is b) B

Light bends towards normal when it passes from air to glass. Light bends away from normal when it passes from glass to air. This is appropriately shown in figure b).

15. You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at the same angle would bend the most?

(a) Kerosene

(c) Mustard oil

(d) Glycerine

The answer is (d) Glycerine

Refractive indices

Kerosene-1.44

Mustard oil-1.46

Glycerine-1.47

Hence Glycerine is optically dense hence ray of light bends more with glycerine.

16. Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in Figure 10.6?

The answer is (d) Fig. D

In the case of the concave mirror, an incident ray is parallel to the principal axis and passes through F after reflection.

17. Which of the following ray diagrams is correct for the ray of light incident on a lens shown in Fig. 10.7?

(a) Fig. A.

(b) Fig. B.

(c) Fig. C.

(d) Fig. D.

The answer is (a) Fig. A.

In a convex lens, the incident ray passing through F goes parallel to the principal axis after refraction.

18. A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.

(a) Plane, convex and concave

(b) Convex, concave and plane

(c) Concave, plane and convex

(d) Convex, plane and concave

The answer is (c) Concave, plane and convex

When the object is between F and P of the concave mirror enlarged image is formed behind the mirror. Hence child can see her head bigger in a concave mirror. She can see her body size of the same size because the plane mirror gives an image of the original size. Convex mirror gives diminished images, and the baby’s legs appear smaller.

19. In which of the following, the image of an object placed at infinity will be highly diminished and point sized?

(a) Concave mirror only

(b) Convex mirror only

(c) Convex lens only

(d) Concave mirror, convex mirror, concave lens and convex lens

The answer is (d) Concave mirror, convex mirror, concave lens and convex lens

Short Answer Questions

20. Identify the device used as a spherical mirror or lens in the following cases, when the image formed is virtual and erect in each case.

(a) Object is placed between the device and its focus, and an image formed is enlarged and behind it.

(b) Object is placed between the focus and device, and an image formed is enlarged and on the same side as that of the object.

(c) Object is placed between infinity and device, an image formed is diminished and between focus and optical centre on the same side as that of the object.

(d) Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.

(a) Concave mirror

(b) Convex lens

(c) Concave lens

(d) Convex mirror

21. Why does a light ray incident on a rectangular glass slab immersed in any medium emerges parallel to itself? Explain using a diagram.

When a light ray enters a denser medium from the rarer medium, it bends towards the normal In this case extent of bending of the ray at the opposite parallel is the same. Hence emergent ray is parallel to the incident ray.

22. A pencil, when dipped in water in a glass tumbler, appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent if, instead of water, we use liquids like kerosene or turpentine? Support your answer with reasons.

The bending of light here is a function of refraction. Refraction is dependent on refractive indices. Refractive indices of kerosene or turpentine would not be the same as water. Hence the degree of the bend would be different in different mediums.

23. How is the refractive index of a medium related to the speed of light? Obtain an expression for the refractive index of a medium with respect to another in terms of the speed of light in these two media.

Refractive Index can be seen as the factor by which the speed and the wavelength of the radiation are reduced with respect to their vacuum values.

w=civ (where n:refractive index,c=speed of light,v:velocity of light in that medium)

The refractive index of one medium in relation to a second medium is given by the ratio of the speed of light In the second medium to the speed of light in the first medium.

24. Refractive index of a diamond with respect to glass is 1.6, and the absolute refractive index of glass is 1.5. Find out the absolute refractive index of the diamond.

Absolute RI of diamond= 1.6

Absolute RI of glass= 1.5

Multiplying them we get 2.4

25. A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images?

When an object is placed in F and F2 of a convex lens, we get an inverted, enlarged and real image is formed beyond 2F2, which is on the other side of the lens. Hence we need to place the object between 20 and 40 cm of the lens.

When an object is placed between F and 0 of a convex lens, its enlarged, erect and virtual image is formed beyond FL i.e. on the same side of the lens. So for this, we need to place the object at a distance less than 20 cm from the lens.

26. Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens. She now tries to focus on the building visible to her outside the window instead of the window pane without disturbing the lens. In which direction will she move the screen to obtain a sharp image of the building? What is the approximate focal length of this lens?

To obtain a clear image of the building, Sudha has to move the screen towards the lens. The focal length will be approximately 15 cm. The rays of light coming from a distant object such as a tree (or a distant building or electricity pole) can be considered to be parallel to each other. When parallel rays of light are incident on a convex lens, the rays, after refraction, converge at focus on the other side of the lens.

27. How are the power and focal length of a lens related? You are provided with two lenses of focal lengths 20 cm and 40 cm, respectively. Which lens will you use to obtain more convergent light?

The power of the lens is inversely proportional to the focal length of the lens. A lens with a focal length of 20 has more power than a lens with a focal length of 40 cm. A lens with higher power should be used to obtain more convergent light.

28. Under what condition in an arrangement of two plane mirrors, incident ray and reflected ray will always be parallel to each other, whatever may be the angle of incidence? Show the same with the help of a diagram.

If two plane mirrors are placed perpendicular to each other, then the incident ray and reflected ray will always be parallel to each other.

29. Draw a ray diagram showing the path of rays of light when it enters with oblique incidence

(i) from air into water, (ii) from water into air.

The speed of light decreases when it passes from a rarer medium to a denser medium, and also, light rays bend towards normal.

When a ray of light passes from a denser medium to a rarer medium-light, rays bend away from the normal.

Long Answer Questions

30. Draw ray diagrams showing the image formation by a concave mirror when an object is placed

(a) between pole and focus of the mirror

(b) between focus and centre of curvature of the mirror

(c) at the centre of curvature of the mirror

(d) a little beyond the centre of curvature of the mirror

(e) at infinity

31. Draw ray diagrams showing the image formation by a convex lens when an object is placed

(a) between optical centre and focus of the lens

(b) between focus and twice the focal length of the lens

(c) at twice the focal length of the lens

(d) at infinity (e) at the focus of the lens

32. Write laws of refraction. Explain the same with the help of a ray diagram, when a ray of light passes through a rectangular glass slab.

Laws of refraction

• Incident ray refracted ray and normal at the point of incidence lie in the same plane.
• The ratio of the sine of incidence and sine of refraction is constant for the given colour and pair of media.

• ABCD is a glass slab. EF is an incident ray which is incident on point 0 on the air-glass interface.

• NO is normal and _LEON = : I; which Is angle of incidence.

• NV is normally extended towards the glass slab and ..LV ’00 = Zri; which is the angle of refraction.

• 00′ is refracted ray from surface AB. It behaves like an incident rayon surface CD.

• the ray EF bends when it enters the slab to become 00′.

• MO’ and O’M’ are normal on surface CD.

• GH is the emergent ray.

• ZOO’ Al = Li,; which is the angle of Incidence at surface CD.

• Z.110′ H = Zr,; which is the angle of refraction at surface CD.

• It is observed that EF. NO and 00′ lie in the same plane: which is in accordance with the first law of refraction.

• It is also observed that EF II GH, which means the emergent ray is parallel to the incident ray. This happens because the degree of bend at opposite surfaces of the glass slab is the same.

33. Draw ray diagrams showing the image formation by a concave lens when an object is placed

(a) at the focus of the lens

(c) beyond twice the focal length of the lens

(a) The ray diagram when the object is placed at the focus of the concave lens:

(b) The ray diagram when the object is placed between focus and twice the length of focal length of the lens:

(c) Ray diagram when the object is beyond twice the focal length of the concave lens:

34. Draw ray diagrams showing the image formation by a convex mirror when an object is placed

(a) at infinity

(b) at a finite distance from the mirror

a) At Infinity

b) At infinite distance from the mirror

35. The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between the lens and the image is 80 cm, at what distance should the candle be placed from the lens? What is the nature of the image at a distance of 80 cm and the lens?

As the image is obtained on the screen, it is real.

Magnification , m = –3 ,

u = –80/3 cm .

1/f = 1/v – 1/u

=1/80 + 3/80

1/f = 1/20cm

f = 20 cm .

The lens is convex and the image formed at 80 cm from the lens is real and inverted.

36. Size of the image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3rd of its size. At what distance has the object been placed from the mirror? What is the nature of the image and the mirror?

Using = 1/v+1/u=1/f

Calculate u;u = – 80 cm.

The image is real and inverted. The mirror is concave.

37. Define the power of a lens. What is its unit? One student uses a lens with a focal length of 50 cm and another of –50 cm. What is the nature of the lens and its power used by each of them?

The degree of convergence and divergence provided by a lens is called the power of the lens. The unit of power of the lens is Diopter D.

The focal length of the lens used by the first student is in positive; hence, it is a convex lens. The lens of the second student is a concave lens.

p=1/f =1/0.5 =2

Power of lens (first student) =+2

Power of lens (second student) = ).2

38. A student-focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under

Position of candle = 12.0 cm

Position of convex lens = 50.0 cm

Position of the screen = 88.0 cm

i) What is the focal length of the convex lens?

ii) Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm?

iii) What will be the nature of the image formed if he further shifts the candle towards the lens?

iv) Draw a ray diagram to show the formation of the image in case (iii), as said above.

Position of the candle flame = 12.0cm

Position of the lens= 50.0 cm

Position of the screen=88.0 cm

i) u= 50-12= 38 cm.

Image distance v= 88-50= 38cm

Focal length =1/v – 1/u= 1/f

ii) Object distance u= 50-31= 19 cm

Object distance = focal length

Hence the image is formed at infinity.

If he further shifts the candle towards the lens. The object comes between F and 0. In this case. The image is virtual, enlarged and erect and is formed on the same side of the lens.

Topics Covered in NCERT Exemplar Class 10 Light Reflection and Refraction:

• Reflection of Light
• Spherical Mirrors
• Image Formation by Spherical Mirrors
• Representation of Images Formed by Spherical Mirrors Using Ray Diagrams Ex
• Sign Convention for Reflection by Spherical Mirrors
• Mirror Formula and Magnification
• Refraction through a Rectangular Glass Slab
• The Refractive Index
• Refraction by Spherical Lenses
• Image Formation by Lenses
• Image Formation in Lenses Using Ray Diagrams
• Sign Convention for Spherical Lenses
• Lens Formula and Magnification
• Power of a Lens.

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Assertion and Reason Questions for Class 10 Science Chapter 10 Light-Reflection and Refraction

• Last modified on: 2 months ago
• Reading Time: 9 Minutes

Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true.

Q.1. Assertion(A) : The centre of curvature is not a part of the mirror. It lies outside its reflecting surface. Reason (R) : The reflecting surface of a spherical mirror forms a part of a sphere. This sphere has a centre.

Q.2. Assertion (A) : A ray passing through the centre of curvature of a concave mirror after reflection, is reflected back along the same path. Reason (R) : The incident rays fall on the mirror along the normal to the reflecting surface.

Q.3. Assertion (A) : Light does not travel in the same direction in all the media. Reason (R) : The speed of light does not change as it enters from one transparent medium to another.

Q.4. Assertion(A) : The emergent ray is parallel to the direction of the incident ray. Reason (R) : The extent of bending of the ray of light at the opposite parallel faces (air- glass interface and glass-air interface) of the rectangular glass slab is equal and opposite.

Q.5. Assertion(A) : A ray of light travelling from a rarer medium to a denser medium slows down and bends away from the normal. When it travels from a denser medium to a rarer medium, it speeds up and bends towards the normal. Reason (R) : The speed of light is higher in a rarer medium than a denser medium.

Q.6. Assertion(A): The mirrors used in search lights are concave spherical. Reason (R) : In concave spherical mirror the image formed is always virtual.

Q.7. Assertion(A) : Light travels faster in glass than in air. Reason (R) : Glass is denser than air.

Q.8. Assertion(A) : For observing traffic at back, the driver mirror is convex mirror. Reason (R) : A convex mirror has much larger field of view than a plane mirror.

Q.9. Assertion(A) : Mirror formula can be applied to a plane mirror. Reason (R) : A plane mirror is a spherical mirror of infinite focal length.

Q.10. Assertion(A) : It is not possible to see a virtual image by eye. Reason (R): The rays that seem to emanate from a virtual image do not in fact emanates from the image.

Q.11. Assertion(A) : When the object moves with a velocity 2 m/s, its image in the plane mirror moves with a velocity of 4 m/s. Reason (R) : The image formed by a plane mirror is as far behind the mirror as the object is in front of it.

Q.12. Assertion(A) : The height of an object is always considered positive. Reason (R) : An object is always placed above the principal axis in this upward direction.

Q.13. Assertion(A) : Concave mirrors are used as make-up mirrors. Reason (R) : When the face is held within the focus of a concave mirror, then a diminished image of the face is seen in the concave mirror.

Q.14. Assertion(A) : Refractive index has no units. Reason (R) : The refractive index is a ratio of two similar quantities.

Q.15. Assertion(A) : The formula connecting u, v and f for a spherical mirror is valid in all situations for all spherical mirrors for all positions of the object. Reason (R) : Laws of reflection are strictly valid for plane surfaces.

Q.16. Assertion(A): A person cannot see his image in a concave mirror, unless, he is standing beyond the center of curvature of the mirror. Reason (R) : In a concave mirror, image formed is real provided the object is situated beyond its focus.

Q.17. Assertion(A): Virtual images are always erect. Reason (R) : Virtual images are formed by diverging lenses only.

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5 thoughts on “ Assertion and Reason Questions for Class 10 Science Chapter 10 Light-Reflection and Refraction ”

it helped a lot thank you

It was awesome but I would like to add a suggestion to add the explanation of each question

Thank you it really use full

It really helped me in my exams thanks a lot keep on posting these AR questions

It is very helpful. But your 11th number answer is wrong. It is (a). But it would be (d). Please check it out.

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Chapter 10 Light Reflection And Refraction

Extra questions for class 10 science chapter 10 light – reflection and refraction.

Get extra questions for Class 10 Science Chapter 10 Light – Reflection And Refraction with PDF. Our subject expert prepared these solutions as per the latest NCERT textbook. These extra questions will be helpful to revise the important topics and concepts. You can easily download all the questions and answers in PDF format from our app.