# CBSE Class 10 Physics Light Reflection And Refraction Worksheet

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## Worksheet for Class 10 Science Chapter 10 Light Reflection and Refraction

Class 10 Science students should refer to the following printable worksheet in Pdf for Chapter 10 Light Reflection and Refraction in Class 10. This test paper with questions and answers for Class 10 will be very useful for exams and help you to score good marks

### Objective Type Questions

Question : Name the type of image that can be obtained on a screen.
a. Real
b. Virtual
c. Blur
d. Undefined
Explanation: A real image is an image which is located in the plane of convergence for the light rays that originate from a given object. If a screen is placed in the plane of a real image the image will generally become visible on the screen. Examples of real images include the image seen on a cinema screen (the source being the projector), the image produced on a detector in the rear of a camera, and the image produced on an eyeball retina

Question : The extent to which a ray of light travelling in one medium and entering the second medium bends depends on:
a. The speed of light
b. None of the above
c. The wavelength of light
d. The frequency of light
Explanation: When a ray of light travels obliquely from one transparent medium to another transparent medium, there is always a change in its speed and direction. The extent to which a ray of light bends, depends on the speed of light in the two media.

Question : 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

Question : 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 in convex.
d. the mirror is convex but the lens is concave.

Question : 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.

Question :  A student has to do the experiment, on finding the focal length of a given concave mirror, by using a distant object. Out of the following set ups (A, B, C, D) available to her A. a screen, a mirror holder and a scaleB. a mirror holder, a screen holder and a scaleC. a screen holder and a scaleD. a mirror holder and a screen holder
a. D
b. C
c. A
d. B
Explanation: The mirror and the screen should be firmly placed for accurate measure of the separation.

Question :  A ray passing through the focus and falling on a convex lens will:
a. retrace its path
b. will emerge parallel to principal axis
c. will emerge through focus on other side
d. will emerge perpendicular to principal axis
Explanation: The ray light passing through the principal focus of the convex lens will emerge as parallel to the principal axis after refraction from the convex lens.

Question : A spherical mirror and thin spherical lens - each have a focal length of -15 cm. It is likely that:
a. The mirror is convex, but the lens is concave.
b. Both are concave
c. Both are convex
d. The mirror is concave, but the lens is convex.
Explanation: The spherical mirror and the spherical lens - both are concave.
The distance of the principal focus measured from the pole is called the focal length. According to the New Cartesian Sign Convention, the focal length of a concave mirror as well as that of a concave lens is considered negative.

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

Question : Why do we prefer a convex mirror as a rear-view mirror in vehicles?
Answer : Convex mirror can cover a wider range and give erect and diminished image. Hence convex mirror is used as a rear-view mirror to get wider field of view.

Question : A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?
Answer : Object distance u = –10 cm (concave mirror)
Magnification m = –3
m = −v/ u
∴ ν= –mu = –(–3) (–10) = –30 cm.
Image formed ν = 30 cm in front of the concave mirror.

Question : Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m/s.
Answer : The speed of light in vacuum is = 3 × 108 m/s
Refractive index of glass ng = 1.50
ng = c/v
Speed of light in glass νg = c/ng  = 3 × 108/1.50
= 2 × 108 m/s.

Question : You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in table above.
Answer : Refractive index of kerosene = 1.44
Refractive index of turpentine = 1.47
Refractive index of water = 1.33
Lower the refractive index faster is the speed of light in that medium. Hence light will travel fastest in water.

Question : Define 1 dioptre of power of a lens.
Answer : 1 dioptre is the power of a lens whose focal length is 1 metre.
1 D = 1 m–1

Question : Find the power of a concave lens of focal length 2 m.
Answer : Focal length of concave lens f = –2 m
Power of concave lens P = 1/f
∴ P = 1/–2
= –0.5 D.

Question : Is it possible that a convergent lens in one medium becomes divergent, when placed in another medium?
Answer : Yes it's possible that convergent lens in one medium acts divergent in another medium . If a lens acts as convergent in a medium having refractive index less than that of lens material, then it will act as divergent in medium having greater refractive index and vice versa.

Question : Out of convex mirror and a concave mirror, whose focus is situated behind the mirror?
Answer : Out of the two spherical mirrors convex and concave mirror, the convex mirror has the focus point situated behind the mirror as its centre of curvature lies behind the mirror due to which it forms virtual and erect image always

Question : What is the unit of refractive index?
Answer : Refractive index has no units as it is a ratio of two similar physical quantities.

Question : An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm.
Find the position and nature of the image.

f = +15 cm, u = – 10 cm.
1/f =  1/ν + 1/u
1/15 = 1/ν + 1 /(– 10)
1/v = 1/15 + 1/10
1/v = 5/30
ν = + 6 cm
The image is formed 6 cm behind the mirror, virtual image is formed.

Question : An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.
Answer : f = R/2 = 30/2  = 15 cm
f = + 15 cm, u = – 20 cm, h = 5.0 cm
1 /v +1/u = 1/f
∴ 1/ ν + 1 /(– 20) = 1/15
1/v =1 /15  + 1/20
1/v = 7/60
∴ ν = 60/7 cm
Image is virtual behind the mirror and erect.
hi/ h= ν / u
⇒ hi/5 = 8.57 / 20
hi = 3.33 cm

Question : Find the focal length of a lens of power –2.0 D. What type of lens is this?
Answer : P = – 2.0 D
P = 1 /f
∴ f = 1/P
= 1/-2.0 D
= –0.5 m.
∴ The lens is concave lens as f = –ve.

Question : An object 3 cm high is placed 20 cm from convex lens of focal length 12 cm. Find the nature, position and height of the image.
Answer : Since lens is convex, therefore/is positive.
Given: u = - 20 cm, f = + 12 cm, h = 3 cm, v= ?, h' = ?
Using lens formula

Question : An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained? Find the size and the nature of the image.
Answer :  u = - 27 cm, f = - 18 cm. h0= 7.0 cm
1/v = 1/f - 1/u
1/v = -1/18 + 1/27 = -1/54
v = - 54 cm
Screen must be placed at a distance of 54 cm from the mirror in front of it.
hi/ho = v/u
hi/7 = +54/-27
hi = -2 7 = -14 cm.
Thus, the image is of 14 cm length and is inverted image.

Question : 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 angle of incidence. Show the same with the help of diagram.
Answer : When two plane mirrors are at 90o then incident ray and reflected ray will always be parallel as explained below:

This means that incident ray and reflected ray will always be parallel; irrespective of value of angle of incidence.

Light is a form of energy that produces in us the sensation of sight.

What is Reflection of Light?

To begin with, the reflection of light occurs whenever a ray of light falls on a smooth polished surface and bounces back. In other words, the ray of light approaching any surface results in the reflection of the light. Further, the ray of light which falls on the surface is known as Incident ray while the ray of light which gets reflected back is called Reflected ray. Also, if a perpendicular is to be drawn between the two rays on the reflecting surface, it is known as a Normal

Incident Ray= It is the ray which falls on the surface Reflected Ray= The ray which is reflected from the surface Normal = Perpendicular on the polished surface P= Point of reflection i= Angle of Incidence r= Angle of Reflection

Laws of Reflection After understanding the meaning of reflection, you must also understand its two imperative laws. Using these laws, the reflection of the incident ray on various surfaces like a plane mirror, water, metal surfaces, etc can be determined. For instance, if we consider a plane mirror, here are the laws of reflection:

• The incident ray, the normal and the reflected ray must lie in the same plane.

• The angle of incidence (i) = The angle of reflection (r).

Types of Reflection While exploring the basics of the reflection of light, it is also important to go through the different types of reflection. Whenever we change the basic elements or the form of basic elements involved in this phenomenon, the result also varies. Following are the main three types of reflection:

• Regular Reflection    Diffused Reflection   Multiple Reflection

Diffused Reflection To explore the meaning of diffused reflection, let us consider reflective surfaces other than mirrors. The common surfaces which can be used for diffusion of light are comparatively rough as they are made up of different material than glass and contain some marks, scratches, dust or dents. All these things hamper the quality and brightness of reflection. Thus, the comparison of both the angles of reflection on such rough surfaces is completely distorted. In diffused reflection, the incident ray falls on different points and gets reflected in an entirely different direction and hence, we see non-shiny objects.

Light-Reflection and Refraction

Question : If a magnification of -1 is to be obtained using a concave mirror of focal length 6 cm, then what should be the position of the object?
Answer :  Magnification of -1 means that the image is real and size of image is equal to the size of the object. This is possible when the object is placed at C of a concave mirror. Therefore, position of object = C = 2f = 12 cm in front of the concave mirror.

Question : A man stands 10 m away in front of a large plane mirror. How far must he walk before he is 5 m away from his image?
Answer :  As the distance between the man and the mirror is 10 m, the distance between man and his image is 10 + 10 or 20 m, as image distance and object distance are equal. Distance between the man and his image is 10m when the man is 2.0 m away from the mirror. Therefore, the man has to walk 10 m - 2.0m = 7.5 m towards the mirror.

Question : How would you decide the medium having highest optical density and medium with lowest optical density?
Answer : Optical density depends upon refractive index. Higher the refractive index, higher the optical density and vice versa.
Diamond (n = 2.42) is having maximum optical density and air (n = 1.0003) is having least optical density.

Question : An object is placed at a distance of 30 cm in front of a convex mirror of focal length 15 cm. Write four characteristics of the image formed by the mirror.
Answer :  The four characteristics of image formed:
(1) Image formed by a plane mirror is always virtual and erect.
(2) The size of image is equal to that of the object.
(3) The image formed is as far behind the mirror as the object is in front of it.
(4) The image is laterally inverted.

Question : List in proper sequence the steps of the experiment for determining the approximate focal length of a given concave mirror by obtaining the image of a distant object.
Answer :  Steps for determining approximate focal length of concave mirror:
(1) Fix a concave mirror on the stand such that it faces a source of bright light or a distant tree.
(2) Place a screen on a stand in front of the reflecting surface of the mirror for obtaining the image of the distant object on it.
(3) Adjust the position of the screen by moving it back and forth until a sharp and clear image of the distant object is obtained on it.
(4) Mark the position of the mirror and the screen and measure the distance between them with a meter scale

Question : What is light? What is its nature?

Question : What is the speed of light in vacuum?

Question : What is a mirror?

Question : What is the focal length of a plane mirror?

Question : Differentiate between real and virtual image.

Question : What type of image is formed on a cinema screen?

Question : A concave mirror is a part of sphere of radius 40 cm. What is the focal length of the mirror?

Question : Radius of curvature of a mirror is 20 cm. What type of mirror is it?

Question : Magnification of a mirror is +2/3. What type of mirror is it?

Question : A 1cm high object is placed at a distance of 2F from a convex lens, what is the height of the image formed?

Question : Magnification of a mirror is ‘—1’. What type of mirror is it? What is the position of object and image? Give the nature of image.

Question : Name the type of mirror used:-

(i) as a reflector in search light (iii) by the dentist

(ii) as side view mirror in vehicles. (iv) as a shaving mirror

Question : Wherever you may stand in front of mirror, your image is always erect & same sized, what type of mirror is it?

Question : (a) A ray of light strikes the mirror at an angle of 200. What is the angle of reflection?

(b) Give the angle of incidence and reflection for normal incidence.

Question : A candle is kept in front of plane mirror at distance of 15 cm. What is distance between candle & its image?

Question : Radius of curvature of a mirror is +24cm. Name the kind of mirror and give the characteristics of the image formed by it.

Question : Define refraction.

Question : State the laws of refraction.

Question : How does the lateral displacement depend upon:- (a) Thickness of the glass slab. (b) Angle of incidence

Question : What is the lateral displacement when a ray of light falls normally on a glass slab?

Question : Refractive index of water with respect to air is 1.33, what is refractive index of air with respect to water?

Question : Under what condition, the angle of refraction will be equal to the angle of incidence?

Question : Refractive index of glass is 1.65, what is the speed of light in glass?

Question : If refractive indices of alcohol & water are 1.36 and 1.33 respectively, which of the two is optically denser?

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