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CBSE - Class 10 Science Light – Reflection and Refraction Worksheet

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 lens and 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?

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

The real image formed by a concave mirror is larger than the object when the object is :

at a distance equal to radius of curvature

at a distance less than the focal length

between focus and centre of curvature

at a distance greater than radius of curvature

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

$frac{3}{2}$

$frac{2}{3}$

$frac{1}{2}$

Draw ray diagrams showing the image formation by a convex lens when an object is placed (b) between focus and twice the focal length of the lens

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

Draw ray diagrams showing the image formation by a concave mirror when an object is placed (a) between pole and focus of the mirror

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 object is kept at a distance less than its focal length c. When object is placed between the focus and centre of curvature d. When object is kept at a distance greater than its radius of curvature

Two thin lenses of power, + 3.5 D and, – 2.5 D are placed in contact. Find the power
and focal length of the lens combination.

1.0 D

100 M

1 m

-1 m

-1.0 D

10.

The image formed by a concave mirror is virtual, erect and magnified. The position of object is :

at focus

between focus and centre of curvature

at pole

between pole and focus

11.

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

12.

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

13.

Draw ray diagrams showing the image formation by a convex lens when an object is placed (e) at the focus of the lens

14.

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

15.

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?

16.

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

17.

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 reason.

18.

Draw ray diagrams showing the image formation by a concave lens when an object is placed (a) at the focus of the lens

19.

The angle of incidence for a ray of light passing through the centre of curvature of a concave mirror is :

45°

90°

0°

180°

20.

Magnification produced by a rear view 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

Worksheet Answers

Option C

10.

Option D

12.

19.

Option C

20.

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