Fizeau Fringes -- from Eric Weisstein's World of Physics

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Optics "> Interference "> Interferometry "> Michelson Interferometry v

Fizeau Fringes

Fringes which result when the mirrors of a Michelson interferometer are not quite parallel. Changing the orientation of the mirrors can produce straight, circular, elliptical, parabolic, or hyperbolic fringes.

Michelson Interferometer