Q. 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 the angle of emergence is equal to 90 degrees
Solution:

It is clear that an angle of deviation has the minimum value ‘dm’ for only one value of the angle of incidence. The minimum value of the angle of deviation when a ray of light passes through a prism is called the angle of minimum deviation.

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