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Q.

A ray of light passes through the equilateral prism such that angle of incidence is equal to the angle of emergence if the angle of incidence is 45°.  The angle of deviation will be

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a

15°

b

75°

c

60°

d

30°

answer is D.

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Detailed Solution

A=60∘,i=e=45∘ By i+e=A+δ ⇒45+45=60+δ⇒δ=30∘
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