In a kaleidoscope, three plane mirrors are inclined with each other at an angle of :

1. 0°
2. 30°
3. 60°
4. 90°

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

1. 0°
2. 30°
3. 45°
4. 60°

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 ?