A ray of light passes through a triangular prism. Show graphically how the angle of deviation varies with the angle of incidence. Hence define the angle of minimum deviation
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Solution and Explanation
The angle of deviation (δ) of light passing through a prism varies with the angle of incidence (i) as shown below. The angle of deviation initially decreases, reaches a minimum value, and then increases as the angle of incidence increases
Definition of Minimum Deviation (δm):
The angle of minimum deviation (δm) is the smallest angle of deviation that occurs when the light passes symmetrically through the prism, i.e., when the angle of incidence equals the angle of emergence.
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