When a ray of light is refracted by a prism such that the angle of deviation is minimum, then

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When a ray of light is refracted by a prism such that the angle of deviation is minimum, then
A. the angle of emergence is equal to the angle of incidence
B. the angle of emergence is greater than the angle of incidence
C. the angle of emergence is smaller than the angle of incidence
D. the sum of the angle of incidence and angle of emergence is equal to 90^@

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