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A certain prism is found to produce a minimum deviation of 38°. It produces a deviation of 44° when the angle of incident is either 42° or 62°.

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A certain prism is found to produce a minimum deviation of 38°. It produces a deviation of 44° when the angle of incident is either 42° or 62°. What is the angle of incidence when it is undergoing minimum deviation ? 

(a) 45°

(b) 49°

(c) 40°

(d) 55°

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Correct option: (b) 49°

Explanation:

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