question_answer

A ray of monochromatic light suffers minimum deviation of 38°, while passing through a prism of refracting angle 60°. Refractive index of the prism material is

A)                 2.4                                         

B)                 0.8

C)                 1.3                                         

D)                 1.5

Correct Answer: D

Solution :

                For a prism of angle A and § being angle of minimum deviation, refractive index of the material of prism is given by \[\frac{3}{2}m{{R}^{2}}\] Given, \[\frac{2}{3}m{{R}^{2}}\]                 \[\frac{5}{4}m{{R}^{2}}\]                 \[\frac{4}{5}m{{R}^{2}}\]                 \[4.58\times {{10}^{-6}}J/{{m}^{3}}\]