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Young's double slit experiment is performed with light from a helium-neon laser with wavelength, 633 nm. The screen is placed 1.2 m away from double slit and the 3rd dark fringe is 1.2 mm from the central bright fringe. By how much does the central bright fringe move if a glass (refractory index, n=2.7) is inserted in the upper slit?

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