does anyone know how to derive this equation regarding the Michelson interferometer:(adsbygoogle = window.adsbygoogle || []).push({});

d_m = (m[lambda])/2

where d_m is the physical distance of a micrometer division, m is the number of fringes that crosses a screen given some d_m and lambda is the wavelength of the laser used to create the interference pattern.

I understand that the path difference divided by the wavelength is responsible for the number of fringes that pass by a certain mark, but I don't understand where the 2 comes from. Can someone help me please?

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# Derivation help

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