question_answer

The minimum refracting angle of a prism of refractive index \[\mu \] for any ray of light incident not to emerge from the other face is

A)  \[{{\sin }^{-1}}\frac{1}{\mu }\]

B)  \[2{{\sin }^{-1}}\frac{1}{\mu }\]

C)  \[2{{\tan }^{-1}}\mu \]

D)  twice the critical angle of prism