alleryTwo coherent sources of intensities I₁ and I₂ interfere. Maximum intensity in pattern:
AI_max = (√I₁ + √I₂)²
BI₁ × I₂
CLarger of I₁ and I₂
DI₁ + I₂
Answer & Solution
Correct answer: A. I_max = (√I₁ + √I₂)²
**For two-source interference:** I = I₁ + I₂ + 2√(I₁I₂) cos φ.
Maximum at cos φ = 1: I_max = I₁ + I₂ + 2√(I₁I₂) = (√I₁ + √I₂)².
**Minimum:** I_min = (√I₁ - √I₂)².
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