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Q.

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

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a

Normal to the face through which it emerges

b

Inclined at -30° to the face through which it emerges

c

Inclined at 60° to the face through which it emerges

d

None of these

answer is A.

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Detailed Solution

We know that δ=i+e−A⇒e=δ+A−i=30o+30o−60o=0o

∴Emergent ray will be perpendicular to the face. Therefore it will make an angle of 90' with the face through which it emerges.

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