Question

A light ray makes an angle of incidence ${60}^o$60o, when it falls on a plane reflecting sheet. The angle of deviation will be :

• A. ${20}^o$
• B. ${40}^o$
• C. ${60}^o$
• D. ${80}^o$

Answer 1

The correct option is C ${60}^o$

Given, $\angle i={60}^o$

$\angle D\left(deviation\right)={180}^o-2\angle i$

$={180}^o-2\times {60}^o={60}^o$