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If mirror M 2 in a Michelson interferometer (see figure) is moved through 0.231 mm, a...

If mirror M 2 in a Michelson interferometer (see figure) is moved through 0.231 mm, a shift of 782 bright fringes occurs. What is the wavelength of the light producing the fringe pattern? (Give your answer in decimal with zero digit after the decimal point, using "nm" (nano meter) as unit).

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