Question

1. Two vertical plane mirrors are inclined at an angle of 60° with each other. A ray of light travelling horizontally is reflected first from
one mirror and then from the other. The resultant deviation is
A plane mirror reflects a pencil of light to form a real image. Then the pencil of light incident on the mirror is
3. What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected
ray from the two mirrors be parallel to each other.
4. A plane mirror reflecting a ray of incident light is rotated through an angle 8 about an axis through the point of incidence in the
plane of the mirror perpendicular to the plane of incidence then, the reflected ray
5. A plane mirror is approaching you at a speed of 10cm/sec. You can see your image in it. At what speed will your image approach
you.
6. A bulb is placed between two plane mirrors inclined at an angle of 60°. The number of images formed are
It is desired to photograph the image of an object placed at a distance of 3m from the plane mirror. The camera which is at a
distance of 4.5m from the mirror should be focused for a distance of
8. A thick plane mirror shows a number of images of the filament of an electric bulb. Of these, the brightest image is
9. A man is 180cm tall and his eyes are 10cm below the top of his head. In order to see his entire height night from toe to head, he uses
a plane mirror kept at a distance of Im from him. The minimum length of the plane mirror required is
10. A person is in a room whose ceiling and two adjacent walls are mirrors. How many images are formed?
11 When a plane mirror is placed horizontally on a level ground at a distance of 60m from the foot of a tower, the top of the tower and
its image in the mirror subtend an angle of 90° at the eye. The height of the tower is
12 A ray of light is incident on a plane mirror at an angle of 30°. The deviation produced in the ray is
13. A ray of light is incident normally on a plane mirror. The angle of reflection will be
14. When light wave suffers reflection at the interface from air to glass, the change in phase of the reflected wave is equal to
15. A ray is reflected in turn by three plain mirrors mutually at right angles to each other. The angle between the incident and the
reflected rays is_
16. Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his right hand. In how
many of the images will he be seen using his right hand.
17. When a plane mirror is rotated through an angle then the reflected ray turns through the angle 20 then the size of the image is​

Answer 1

Answer:

Because light travels in straight line

Answer 2

Answer:

n = 8

n = 360 / 0 - 1

n + 1 = 360 / 0

( 8 + 1 ) = 360 / 0

:. 0 = 360 / 9 =40

0 = 40 .

Explanation: