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Fringes are produced with monochromatic ...

Fringes are produced with monochromatic light of wave-length `5.45xx10^(-5)` cm. A thin glass plate of refractive index 1.5 is then placed normally in the path of one of the interference beams and the central bright band of the fringe system is found to move into the position previously occupied by the third bright band from the system. Find the thickness of the glass plate.

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