In a periscope, two plane mirrors are inclined at an angle of …………… with the vertical walls.

1. 0°
2. 30°
3. 45°
4. 60°

Two mirrors are placed at right angles to each other as shown in the figure given below. A ray of light PQ strikes mirror OM at an angle of incidence 30°. What would be its angle of reflection from mirror ON ?

1. 30°
2. 60°
3. 45°
4. 90°

How does an optician increase the effective length of his room by using a mirror ? Where does he place the sign board

What relationship do the images formed by two inclined plane mirrors have for their location with respect to the object placed between them ?