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An equilateral prism is placed on a hori...

An equilateral prism is placed on a horizontal surface. A ray PQ is incident onto it. For minumum deviation,

A

PQ is horizontal

B

QR is horizontal

C

Rs is horizontal

D

any one will be horizontal

Text Solution

Verified by Experts

The correct Answer is:
b.
For minimum deviation, incident angle is equal to emerging angle. Therefore, QR is horizontal.
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