Question

Define the terms angle of deviation for a Ray of light incident on an equilateral prism of angle A

Answer 1

The angle of deviation through a triangular prism is defined as the angle between the incident ray and the emerging ray (angle δ). It can be shown that when the angle of. incidence i is equal to the angle of refraction r' for the emerging ray, the angle of deviation is at a minimum.

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Answer 2

Angle of deviation of an equilateral prism is that angle which is formed when the incident ray and emergent ray are extended backwards