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A thin flake of mica (n = 1.58) is used to cover one slit of a double-slit interference arrangement.The central point on the viewing screen is now occupied by what had been the seventh bright side fringe (m = 7). If \lambda = 550 nm, what is the thickness of the mica?

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The phase difference is, The expression of the phase difference between two light waves when they travel through the two-diff

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