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Question

A ray of light passes through an equilateral prism such that the angle of incidence is equal to 34th the angle of emergence and the latter is equal to 3/4th of the angle of prism. The angle of deviation is


A

45

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B

39

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C

20

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D

30

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Solution

The correct option is D

30


As angle of incidence is equal to the angle of emergence; the prism is in the minimum deviation position. Given A=60 i=34×60=45
45=60+δm2 or δm=30


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