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A thin film has a thickness of 0.04650 cm and a refractive index of 1.5230. Find the angle l/J at which the dark fringe 122.5

A thin film has a thickness of 0.04650 cm and a refractive index of 1.5230. Find the angle l/J at which the dark fringe 122.5 will be observed if monochromatic light 6560 A is used as an extended source.

answers:

m=2159

theta'=19.39

theta=30.4

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