Question

A prism having refractive index `sqrt2` and refractive angle `30^@` has one of the refractive surfaces polished. A beam of light incident on the other surfaces will trace its path if the angle of incidence is
A. `0^@`
B. `30^@`
C. `45^@`
D. `60^@`

Answer 1

Correct Answer - C
`r_2=0^@, and r_1=A=30^@`
Applying `mu=(sini_1)/(sinr_2)`
`sqrt2=sini_1/sin 30^@`
Solving, we get `i_1=45^@`