Question

two plane mirror are inclined to each other at an angle. a ray of light is reflected first at one mirror and then at the other. the lotal deviation of the ray is

Answer 1

i think it may be 30 degree

Answer 2

As per the question, two mirrors are inclined to each other.

Let the ray strikes the first mirror at an angle of incidence $i_{1}$

The light is reflected by the first mirror and incidents on the second mirror.

Let the angle of incidence of the ray for the second mirror is $i_{2}$

We are asked to calculate the total deviation.

The deviation for the first mirror is calculated as d =  $180\ -2i_{1}$

The deviation for the second mirror is calculated as d' = $180-2i_{2}$

The total deviation D = d + d'

                                   = $(180-2i_{1}) +(180-i_{2})$

                                  = $360-2(i_{1} +i_{2})$      [ans]