question_answer

A ray of light is incident on a \[60{}^\circ \] prism at the minimum deviation position. The angle of refraction at the first face (i.e., incident face) of the prism is                               [AIPMT (M) 2010]

A)  zero        

B)    \[{{30}^{o}}\]

C)  \[{{45}^{o}}\]                       

D)       \[{{60}^{o}}\]

Correct Answer: B

Solution :

The refracting angle of prism

For minimum deviation

or