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Q.

A ray is incident at an angle of incidence i on one surface of a prism of small angle A and emerges normally from the opposite surface. If the refractive index of the material of the prism is µ, the angle of incidence i is nearly equal to

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a

A/µ

b

A/2µ

c

µA

d

µA/2

answer is C.

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Detailed Solution

Since the ray emerges normally, therefore e: 0.According to relation A + δ = i + e, we get i = A + δ.Hence by δ=(µ - 1)A, we get i = µA
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