Question

How many images will be obtain by two mirrors kept at 120°

Answer 1

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 /120 ) - 1

=> n = 3 - 1

=> n = 2

Answer 2

Given 120•

So angle I =angle r

So 130 + 90=

220 degree