question_answer

A ray of light is incident at an angle of incidence, i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is \[\mu ,\]the angle of incidence i, is nearly equal to                                                                                                               [AIPMT (S) 2012]

A)  \[\mu A\]         

B)       \[\frac{\mu A}{2}\]

C)  \[A/\mu \]        

D)       \[A/2\mu \]

Correct Answer: A

Solution :

           

Refractive index

In case of small angle.