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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

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The correct Answer is:
B
NOTE: For minimum deviation, incident angle is equal to emerging angle and QR is parallel to base.
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