Solutions of chapter 10. Light-Reflection and Refraction

1

Complete the following ray diagram by drawing suitable

2

Complete the following ray diagram by drawing suitable rays.

3

What is the difference between virtual images produced by concave, plane and convex mirrors?

4

For driving a car what type of mirror would you prefer to see the traffic at your back and why? Explain why it is preferred over a plane mirror?

5

An erect image three times the size of the object is formed with a concave mirror of radius of curvature 36 cm. What is the position of the image?

6

Copy the figure and show the image formation with the help of rays. Write three characteristic of the image formed.

7

Discuss the position and nature of the image formed by a concave mirror when the object is moved from infinity towards the pole of mirror.

8

Figure below shows an object AB placed on the principal

axis of a convex lens placed in air. F₁ and F₂ are the two foci of the lens. Copy the diagram. (i) Draw a ray of light starting from B and passing through O. Show the same ray after refraction by the lens. (ii) Draw another ray from B which passes through F₂ after refraction by the lens. (iii) Locate the final image formed. (iv) Is the image real or inverted?

9

Find the position, nature and size of the image of an object 3 cm high place at a distance of 9 cm from a concave mirror of focal length 18 cm.

10

With the help of ray diagrams, show the formation of image of an object by a concave mirror. When it is placed: (i) beyond the centre of curvature (ii) at the centre of curvature.

1

Multiple images are formed by a thick plane mirror. Which of the following is the brightest of all the images?

2

A plane mirror is placed vertically facing due north. An arrow pointing north-east is kept in front of the mirror. In which direction will the arrow point in this image?

3

When a plane mirror is rotated through a certain angle, the reflected ray turns through twice as much and the size of the image:

4

The image formed by a convex mirror is only one-third of the size of the object. If the focal length of the mirror is 12 cm, the image formed will be

5

A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is:

6

If an object is placed symmetrically between two plane mirrors, inclined at an angle of 72°, then total number of images formed is:

7

A plane mirror produces a magnification of:

8

A dice is place with one of its edges parallel to the principal axis between the principal focus and the centre of curvature of concave mirror. Then the final image has the shape of:

9

Two adjacent walls and the ceiling of a rectangular room are mirror surfaced. The number of images of himself that an observer sees is:

10

Image formed by a convex spherical mirror is:

11

A diminished virtual image can be obtained only in:

12

A convex mirror has a focal length f. A real object is placed at a distance f in front of it. The mirror produces an image at:

13

A light ray incident normally on a plane mirror suffers deviation of:

14

A convex mirror is used to form the image of a real object. Then tick the wrong statement:

15

An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm. The image produced is:

16

Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with the right hand. In how many images will he be seen using his left hand?

1