Two identical slits S₁ and S₂ are illuminated by a point source P. Let the source-to-slit and slit-to-Q path segments be λ₁, λ₂, λ₃ and λ₄ as shown. Which condition gives destructive interference at Q?
Physics · Wave Optics
Two identical slits S₁ and S₂ are illuminated by a point source P. Let the source-to-slit and slit-to-Q path segments be λ₁, λ₂, λ₃ and λ₄ as shown. Which condition gives destructive interference at Q?

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