Physics, 10.04.2020 00:17, BIGJAYWESTSIDE

The yellow sodium D lines have wavelengths of 589.0 nm and 589.6 nm. When they are used to illuminate a Michelson interferometer, it is noted that the interference fringes disappear and reappear periodically as the mirror M1 is moved. Why does this happen? How far must the mirror move between one disappearance and the next?

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The yellow sodium D lines have wavelengths of 589.0 nm and 589.6 nm. When they are used to illuminat...