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A ray of light falls on one of the later...

A ray of light falls on one of the lateral surfaces of an equilateral glass prism placed on the horizontal surface of a table as shown in figure . For minimum deviations of ray, which of the following is true ?

A

PQ is horizontal

B

QR' is horizontal

C

RS' is horizontal

D

Either 'PQ' or 'RS' is horizontal

Text Solution

Verified by Experts

The correct Answer is:
B
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