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# A ray of light is incident on an equilateral prism in such a way that the angle of incidence is equal to the angle of emergence and each is equal to 3/4 of the prism angle. The angle of deviation for the ray of light is 45∘30∘39∘20∘

A
30
B
45
C
39
D
20
Solution
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#### As angle of incidence is equal to the angle of emergence the prism is set in minimum deviation positionδmin=ii+ie−A=34(60+60)−60=30o.

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