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Q.

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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a

30o

b

60o

c

45o

d

Data in sufficient

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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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