Question

In the double-slit experiment of the figure, the viewing screen is at distance D = 4.77 m, point P lies at distance y = 20.8 cm from the center of the pattern, the slit separation d is 4.51 μm, and the wavelength λ is 654 nm. What is the ratio of the intensity IP at point P to the intensity Icen at the center of the pattern?

Incident wave 2 Path length difference Δ.

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