Angle of deviation (δ) by a prism (refractive index μ and small prism angle A) can be written as:
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Angle of deviation (δ) by a prism (refractive index μ and small prism angle A) can be written as:

G1 Physics · Accepted Answer

Step 1: A = r₁ + r₂; total deviation δ = i + e − A. Step 2: For small angles, Snell’s law gives i ≈ μr₁ and e ≈ μr₂. Step 3: δ ≈ μ(r₁+r₂) − A = (μ − 1)A. Final answer: (A) (μ − 1)A.