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Q.

A parallel beam of monochromatic light is incident at one surface of a equilateral prism. Angle of incidence is 55° and angle of emergence is 46°. The angle of minimum deviation will be

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a

Less than 41°

b

Equal to 41°

c

More than 41°

d

None of the above

answer is A.

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Detailed Solution

By the hypothesis, we know thati1+i2=A+δ⇒55∘+46∘=60∘+δ⇒δ=41∘  But δm<δ, so δm<41∘
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