In a Young's double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is 1/8th of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe is close to

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(3) 0.85. Phase difference φ = (2π)/8 = π/4. I/(I₀) = cos²φ/2 = cos²π/8. = (1+cos 45°)/2 = (1+0.707)/2 ≈ 0.85.

In a Young's double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is 1/8th of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe is close to

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