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Case Study and Passage Based Questions for Class 10 Science Chapter 10 Light Reflection and Refraction

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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, and then the MCQ questions based on it will be asked.

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

Question 1:

Read the following and answer any four questions from (i) to (v).

The spherical mirror forms different types of images when the object is placed at different locations. When the image is formed on 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 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 image of the object. The convex mirror is used as a rear view mirrors in automobiles because it can form an small and erect image of an object.

(i) When an object is placed at the centre of curvature of a concave mirror, the image formed is (a) larger than the object (b) smaller than the object (c) same size as that of the object (d) highly enlarged.

(ii) 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.

(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. (a) Plane, convex and concave (b) Convex, concave and plane (c) Concave, plane and convex (d) Convex, plane and concave

(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.

(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.

Question 2:

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 (a) at focus (b) at 2F (c) at optical center (d) between Fand 2F

(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

(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

(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

(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

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Case Study Questions Class 10 Science Light Reflection and Refraction

Case study questions class 10 science chapter 10 light reflection and refraction.

$Light Reflection and Refraction Case Study Questions and answers$

At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.

Case study:1

We can see when the pencil immersed in water it appears like bent at the water air interface. Also, the letters appears to be raised when we will see that letters through a glass slab placed over it. If the media used are different that means the bending of light is different in different media. And hence we can say that the light does not travel along a straight line path through different media. According to the velocity of light in that medium the bending of light takes place. Thus, we can say the phenomenon in which light ray bends or changes its direction when traveling from one medium to other is called as refraction of light. And also we can observed that if the ray of light is traveling from rarer medium to denser medium it bends towards the normal whereas when the ray of light travels from denser medium to rarer medium it bends away from the normal. And the extent of bending of light in a particular medium depends on the refractive index of the medium mostly. More the refractive index more is the bending or denser is the medium and less will be the velocity of light in that medium.

If less is the refractive index then less will be the bending or medium is rarer and velocity of light will be more in that medium. Like the refractive index of air is found to be 1.0003 and that of water is found to be 1.33. And hence water is more denser than air, air is rarer medium as compared to water. Thus, velocity of light in air medium is greater than velocity of light in water medium.

The absolute refractive index of the medium is given by

Absolute Refractive index= (speed of light in air)/(speed of light in medium) = c/v

Thus, for different media refractive index is different and accordingly the velocity of light is also different.

1) If the refractive indices of glass and ice are 1.52 and 1.31 respectively. Then in which medium the velocity of light is more? What it’s value?

( Velocity of light in air= 3*108 m/s)

2) How you can define rarer and denser medium on the basis of optical density?

3) If the Refractive index of diamond is found to be highest i.e. 2.42 then what it indicates?

4) What will happen if we took a glass filled with kerosene instead of water? What would be the observations?

Case study: 2

We have, the object distance is the distance of the object from the pole of the mirror. And we always know that object is placed in front of mirror that means on left side and hence object distance u is always taken as negative. The distance of the image from the pole of the mirror is taken as image distance. The image distance may be positive or negative on the basis of nature of image formed. And the distance of principal focus from the pole is called as focal length of the mirror. Thus, the relationship between the object distance u, image distance v and focal length f is given by mirror formula.

Mirror formula:

1/v + 1/u = 1/f

And magnification in case of mirror gives the extent to which the image is magnified as compared to object size. Magnification is given by the ratio of height of image (h’) to the height of object (h).

Thus, magnification = (height of image)/(height of object)

Thus, m = h’/h

Also, in terms of object distance and image distance magnification is given by,

Magnification m = h’/h = -v/u

As we know that, image height is positive if the image formed is virtual while height of image is negative for real images.

Similarly in case of lenses, lens formula is given by

1/v – 1/u = 1/f

And magnification in case of lenses is given by

Magnification m = h’/h = v/u

The power of lens depends on the focal length of the lens and it is the ability of the lens to diverge or converge the number of rays incident on it. Also, power of lens is defined as the reciprocal of focal length of the lens.

Thus, P = 1/f

Questions :

1) If the focal length of the lens is measured in meter what will be the unit of power of lens?

2) What is the sign of power of convex and concave lens?

3) If the lenses placed in contact of powers P1, P2, P3, P4 are used then what is the net power of lens system?

4) If the magnification produced is negative and positive in case of mirrors then what about the nature of images formed there?

1) If the focal length of the lens is used in meter then the power of the lens is measured in dioptre or D or m-1.

2) As the focal length of convex lens is positive and hence the power of convex lens is positive.

Also, as the focal length of concave lens is negative and hence the power of concave lens is negative.

3) If in a lens system four lenses of power P1, P2, P3 and P4 are in contact then net power of lens system is the algebraic sum of given power of lenses.

P= P1 + P2 + P3 + P4

4) If the magnification produced is negative then the image formed is real. And if the magnification produced is positive then the image formed is virtual.

Case study:3

As we know that, in case of concave mirrors when a ray of light parallel to principal axis strikes the mirror and after reflection it passes through principal focus of the concave mirror. Also, a ray which is passing through the principal focus of the concave mirror after reflection goes parallel to the principal axis. And the ray of light which is passing through the centre of curvature of concave mirror after reflection retraces the same path in backward direction. Because of converging property of concave mirrors they are used in solar furnaces to concentrate more light to produce huge amount of heat energy. They are also used in search lights, torches, head lights of vehicles so that a strong parallel beam of light will be produced. Also, in case of shaving mirrors concave mirrors are used to see larger face of the person.

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.

In concave mirror, when the object is at infinity the image formed will be at focus F and which is highly diminished, point sized, real and inverted.

1) In case of concave mirror when the image formed is virtual and erect?

2) In which case the image formed is of same size as the object in case of concave mirrors?

3) Which mirrors are called as converging and diverging mirror?

4) The focal length of concave mirror is______ and the focal length of convex mirror is _______.

1) In case of concave mirrors, when the object is placed between pole P and focus F of the mirror then the image formed is behind the mirror which is enlarged, virtual and erect.

2) When the object is placed at centre of curvature C of the mirror then image formed is also at centre of curvature C which is of same size, real and inverted.

3) Concave mirror is called as converging mirror while convex mirror is called as diverging mirror.

4) The focal length of concave mirror is positive and the focal length of convex mirror is negative.

We hope that above case study questions will help you for your upcoming exams. To see more click below –

Class 10 Assertion & Reason
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Answer for the 4th question of the last case study is wrong

It is +ve for convex mirror and -ve for concave mirror

Where is the case 1 answer

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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

$Case StuCase Study Chapter 10 Light Reflection and Refractiondy Chapter 10 Light Reflection and Refraction$

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?

$Case Study Chapter 10 Light Reflection and Refraction$

(a) A (b) B (c) C (d) D

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

$Case Study Chapter 10 Light Reflection and Refraction$

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

$Case Study Chapter 10 Light Reflection and Refraction$

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

$Case Study Chapter 10 Light Reflection and Refraction$

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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.

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.

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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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.

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Light Reflection and Refraction Case Study Based Questions with Solutions

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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.
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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
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Open Selfstudys website.