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Monochromatic plane waves of wavelength 667nm are incident on two narrow slits and produce an interference...

Monochromatic plane waves of wavelength 667nm are incident on two narrow slits and produce an interference pattern on a wall 1.2m away. The slits are spaced 35.2μm apart and are 2.2μm wide each. What is the ratio of the intensity to that of the central fringe a distance of 27.6mm from the central fringe?

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