In interference pattern from two coherent light sources of intensity ratio n, the ratio (Iₘₐₓ - Iₘᵢₙ)/(Iₘₐₓ + Iₘᵢₙ) is:
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Question

In interference pattern from two coherent light sources of intensity ratio n, the ratio (Iₘₐₓ − Iₘᵢₙ)/(Iₘₐₓ + Iₘᵢₙ) is:

G1 Physics · Accepted Answer

Step 1: Iₘₐₓ = (√I₁ + √I₂)² and Iₘᵢₙ = (√I₁ − √I₂)². Step 2: Numerator = 4√(I₁I₂), denominator = 2(I₁ + I₂). Step 3: Ratio = 2√(I₁I₂)/(I₁ + I₂). Put I₁/I₂ = n. Final answer: (B) 2√n/(n + 1).