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A ray of light is incident at an angle o...

A ray of light is incident at an angle of `60^(@)` on one face of a prism of angle `30^(@)`. The ray emerging out of the prism makes an angle of `30^(@)` with the incident ray. The emergent ray is

A

normal to the face through which it emerges

B

Incline at `30^(@)` to the face through it emerges

C

inclined at `60^(@)` to the face through it emerges

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Deviation of ray in prism is given by,
`delta=i+e-A`
So, `e=delta+A-i=30^(@)-60^(@)=0^(@)`
So, emergent ray will be perpendicular to face, or emergent ray will make an angle of `90^(@)` with the face through which it emerges.
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