Question

If a ray of light is incident on a plane mirror at an angle ${60}^{\circ }$ with the mirror surface, then deviation produced by mirror (in degrees) is (Give integer value)

Answer 1

Given :

Angle of incidence, $i=90–60={30}^{\circ }$

Deviation produced by plane mirror is given by$$\delta =180-2i$$Substituting the data given in the question we get,

$\delta =180-60={120}^{\circ }$

Accepted answer : $120$