Question

If a ray of light is incident on a plane mirror at an angle ${60}^{\circ }$ from the mirror surface, then deviation produced by mirror is (in degree):

Answer 1

Deviation produced by plane mirror is given by
$\delta =180-2i$
Here, $i=90-60={30}^{\circ }$
$\delta ={180}^{\circ }-{60}^{\circ }={120}^{\circ }$