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Angle of deviation (δ) by a prism (refractive index = μ and supposing the angle of prism A to be small) can be given by

1. δ = (μ − 1)A
2. δ = √(μ + 1)A
3. δ = sin 4A / 2
4. δ = μ − 1 / μ + 1 A

Correct answer: δ = (μ − 1)A

Solution

For a small angle of the prism (A), the angle of deviation (δ) is approximately given by δ = (μ − 1)A, where μ is the refractive index of the prism. This is derived from the prism formula under the small-angle approximation.

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