Question

Find the number of images formed when the angle between two mirrors is 90 degree

Answer 1

We know the formulae

Number of images = 360°/angle b/w
mirrors -1

No. Of images= 360/90-1
= 4-1
=3

Answer 2

The number of images formed when two mirrors are placed at an angle theta to each other is given by:

n = ( 360 / theta ) - 1

So, here, we have the mirrors placed perpendicular to each other. So, theta = 90 degree

=> n = no. of images formed

=> n = ( 360 / 90 ) - 1

=> n = 4 - 1

=> n = 3

So, a total of three images will be formed.