Question: In Michelson's interferometer the yellow sodium line composed of two wavelengths 1 = 589.0 nm and 2 = 589.6 nm was used. In the process

In Michelson's interferometer the yellow sodium line composed of two wavelengths λ1 = 589.0 nm and λ2 = 589.6 nm was used. In the process of translational displacement of one of the mirrors the interference pattern vanished periodically (why?). Find the displacement of the mirror between two successive appearances of the sharpest pattern.

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