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Q.

A plot of angle of deviation (D) 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

45o

b

Data in sufficient

c

60o

d

30o

answer is C.

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Detailed Solution

At minimum deviation condition the ray inside the prism travels parallel to the base of the prism . 

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