Question: A Michelson interferometer is used with a light source of a wavelength of = 4 4 9 . 3 2 9 mm . When

A Michelson interferometer is used with a light source of a wavelength of \=449.329 mm. When one of the mirrors is moved a distance L, we observe at the output N=1497 transitions from light to dark back to light or equivalently from construc-tive interference to destructive interference to constructive interference.
What is the distance L?
Answer in units of mm.

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