Question

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

Answer 1

Correct Answer - C

`1xxsini=musinA`
When A is small, `sinA=A`
`sini=muA`
`i=muA`