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Also known as Abbe constant, it inversely quantifies the amount of dispersion in an optical medium. It is given by a function of the refractive index of a material at the f (486.1nm), d (587.6nm), and c (656.3nm) wavelengths. A material with a high Abbe number means that the different wavelengths will have nearly the same index of refraction in that medium, yielding less separation between wavelengths of light.

See also Angle of Incidence , Glass Code , Angle of Reflection , Index of Refraction (n) , Dispersion

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