question_answer

A monochromatic light is incident at a certain angle on an equilateral triangular prism and suffers minimum deviation. If the refractive index of the material of the prism is \[\sqrt{3},\]then the angle of incidence is- [JEE Main 11-Jan-2019 Evening]

A) \[60{}^\circ \]

B) \[45{}^\circ \]

C) \[90{}^\circ \]

D) \[30{}^\circ \]

Correct Answer: A

Solution :

[a] For minimum deviation, i =e

Using snell’s law at the interface,

.