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

Answer

A

Explanation

Refractive index, `mu=(sin i)/(sin r) Rightarrow mu(sini)/(sinA)`

In case of small angle `mu=(i)/(A)`
Angle of incidence, `i=muA`