I want to get the solution for this - Physics - Force and Pressure

Question

I want to get the solution for this

Priya Chauhan · Accepted Answer

Dear student,
A ray of light that is incident
on to the surface of a plane-mirror is reflected with the angle of
incidence equal to the angle of reflection The ray is making an angle θ with the
surface of the mirror The
total angle between the straight-line path and the reflected ray is
twice the angle of incidence The deviation of a mirror is equal to twice the
angle of incidence
so
Angle of deviation=<img src=
"http://latex%20codecogs%20com/gif%20latex?2%5Ctheta%20%3D%202%5Ctimes%2015%5E%7B%5Ccirc%7D%3D30%5E%7B%5Ccirc%7D"
title=
"This is the rendered form of the equation You can not edit this directly Right click will give you the option to save the image, and in most browsers you can drag the image onto your desktop or another program ">

Regards