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When a ray of light is incident normally...

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`

A

the ray undergoes total internal reflection at the second refracting surface of prism

B

emergent ray is deviated by `30^(@)`

C

emergent ray is deviated by `60^(@)`

D

emergent ray just graze the second refracting surface of the prism

Text Solution

Verified by Experts

The correct Answer is:
A
PQ is incident ray. QR is refracted ray RS is the ray at second surface reflected internally . Since, the angle of incidence at second surface is `60^(@)` which is greater than the ciritical angle of glass.
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