When a ray of light is incident normally on one refracting surface of an equilateral prism (Refractive index of the material of the prism `=1.5`

Options

A. emerging ray is deviated by `30^(@)`
B. emerging ray is deviated by `45^(@)`
C. emerging ray just grazes the second refracting surface
D. the ray undergoes total internal reflection at the second refracting surface

Answer

D

Explanation

(d) Here, `i_(1)=0=r_(1)`
Therefore,`r_(2)=A=60^(@)`
`theta_(C)=sin^(-1)(1/1.5)=41.8^(@)`
`rArr r_(2)gttheta_(C)`