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[" A parallel light beam of wavelength "6000" A passes "],[" through a slit "0.2mm" wide and forms a diffraction "],[" pattern on a screen "1.0m" away from the slit.Find the "],[" width of the central maximum on the screen.What "],[" would be the width of this maximum,if the apparatus "],[" be immersed in water of refractive index "4/3?]

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