Question

The angle of minimum deviation for a prism is ${40}^o$ and the angle of the prism is ${60}^o$.The angle of incidence in this position will be:

• A. ${30}^o$
• B. ${60}^o$
• C. ${50}^o$
• D. ${100}^o$

Answer 1

The correct option is C ${50}^o$

Angle of minimum deviation $D_m=2i-A$

${40}^0=2i-{60}^0$

$i={50}^0$