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Quasimonochromatic light with an average wavelength of 500 nm illuminates a Michelson Interferometer. The movable mirror-M1...

Quasimonochromatic light with an average wavelength of 500 nm illuminates a Michelson Interferometer. The movable mirror-M1 is farther from the beamsplitter than is fixed mirror-M2 by a distance d. Decreasing d by 0.100 mm causes a number of fringe-pairs to sweep past a hairline in a viewing scope. Determine that number.

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