A plot of angle of deviation ( $δ$ ) versus angle of incidence (i) for a triangular prism is shown below. The angle of incidence for which the light ray travels parallel to the base is

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Data in sufficient

30^o

45^o

60^o

answer is C.

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Detailed Solution

For light to travel parallel to the base of prism, it should be a minimum deviation condition. For minimum deviation of δ = 40⁰ from graph, i = e = 45⁰.

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