Angle of deviation (δ) by a prism (refractive index = µ

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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 A + δ
  2
  sin A
  2
4. δ = µ - 1 A
  µ + 1

Correct Option: A

When the angle of prism is small, δ = (µ – 1) A