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In a biprism experiment, the slit and the eyepiece. are 10 cm and 80 cm away from
the biprism. When a convex lens was interposed at 30 cm from the slit, the
separation of the two magnified images of the slit was found to be 4.5 mm. If the
wavelength of the source is 4500 Å, calculate the fringe width.

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