Question

A prism has a refracting angle of 60${}^o$. When placed in the position of minimum deviation, it produces a deviation of 30${}^o$. The angle of incidence is

• A. 30${}^o$
• B. 45${}^o$
• C. 15${}^o$
• D. 60${}^o$

Answer 1

The correct option is B 45${}^o$

$i=\frac{A+{\delta }_m}{2}=\frac{60+30}{2}={45}^o$