In Young's double slit experiment, using monochromatic light of wavelength λ, the intensity of light at a point on the screen where the path difference is λ, is K units. The intensity of light at a point where the path difference is λ/3 will be

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(3) K/4. I=I₀ cos²φ/2, with phase difference φ=(2π)/λΔ x. Δ x=λ: φ=2π, I=I₀, so K=I₀. Δ x=λ/3: φ=(2π)/3, I=I₀ cos²π/3=(I₀)/4. So the intensity is K/4.

In Young's double slit experiment, using monochromatic light of wavelength λ, the intensity of light at a point on the screen where the path difference is λ, is K units. The intensity of light at a point where the path difference is λ/3 will be

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