In a Young's double-slit experiment, the amplitudes of light coming from the two slits are in the ratio 2:1. The ratio of maximum to minimum intensity is:
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Question

In a Young's double-slit experiment, the amplitudes of light coming from the two slits are in the ratio 2:1. The ratio of maximum to minimum intensity is:

G1 Physics · Accepted Answer

Let the amplitudes be A₁ = 2A A₂ = A Maximum intensity: Iₘₐₓ ∝ (A₁ + A₂)² = (3A)² = 9A² Minimum intensity: Iₘᵢₙ ∝ (A₁ - A₂)² = A² Therefore, Iₘₐₓ : Iₘᵢₙ = 9 : 1 Hence option A follows.