Question

A ray incident at ${15}^0$ on one refracting surface of prism of angle ${60}^0$, suffers a deviation of ${55}^0$. The angle of emergence is

• A. ${95}^0$
• B. ${45}^0$
• C. ${30}^0$
• D. ${100}^0$

Answer 1

Answer: (D)

${100}^0$

$\begin{array}{c}i={15}^{\circ }\text{angle of incidence}\\ A={60}^{\circ }\text{angle of prism}\\ \delta ={55}^{\circ }\text{deviation}\\ \text{According to prism formula}\\ i+e=A+\delta \text{e=emergence}\\ 15+e=60+55\\ e={100}^{\circ }\end{array}$