question_answer

A equilateral prism is made of a transparent material of refractive index\[\sqrt{2}\]. A ray of light AB is incident at \[45{}^\circ \]as shown. The net deviation in the path of ray when it comes out of prism is

A) \[135{}^\circ \]

B) \[120{}^\circ \]

C) \[30{}^\circ \]  

D) \[150{}^\circ \]

Correct Answer: D

Solution :

[d] \[\delta =\left( 45{}^\circ -30{}^\circ  \right)+\left( 180{}^\circ -60{}^\circ  \right)+\left( 45{}^\circ -30{}^\circ  \right)\] \[=150{}^\circ \] Clockwise.