A ray of light is incident at small angle I on the surface of prism of small angle A and emerges normally from the oppsite surface. If the refractive index of the material of the prism is mu, the angle of incidence is nearly equal to

Options

A. `A//mu`
B. `A//2mu`
C. `muA`
D. `(muA)/(2)`

Answer

C

Explanation

`mu=sin(sin i)/(sin r)=(sin i)/(sin A)=(i)/(A)` (for small angle)