A ray of light is incident perpendicularly at point A on a rectangular medium with different refractive indices, $n_1$ and $n_2$, in a configuration as shown schematically in the figure. The angle that the emergent ray makes, with respect to normal at point $B$, is

• A

  greater than $0^{\circ}$
• B

  less than $0^{\circ}$
• Correct answer
  C

  $0^{\circ}$
• D

  $\sin ^{-1}\left(n_2 / n_1\right)$

Hence, the correct answer is option: 'C'.