Show that, when the apex angle of a prism is small and the angles involved are small,…

PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

Show that, when the apex angle

A

of a prism is small and the angles involved are small, the angular deviation

d

produced by the prism can be approximated by

d \approx (\mu - 1)A

, where

\mu

is the refractive index of the prism material with respect to air.