Question

The angle of the prism is ${30}^{\circ }$ . The rays incident at ${60}^{\circ }$ at one refracting face suffer a deviation of ${30}^{\circ }$. Then, the angle of emergence is :

• A. $0^{\circ }$
• B. ${30}^{\circ }$
• C. ${60}^{\circ }$
• D. ${90}^{\circ }$

Answer 1

The correct option is A $0^{\circ }$

A = 30 °

i = 60°

$\delta$ = 30°

$\delta$ = i + e - A

=> e = 30° + 30 ° - 60° = 0°.