A measure of how much the index of refraction of a material changes with respect to wavelength. It also determines the separation of wavelengths known as chromatic aberration. Quantitatively, dispersion is inversely given by the Abbe number.

See also Abbe-Number , Angle of Incidence , Angle of Reflection , Index of Refraction (n) , Littrow Dispersion Prism , Chromatic Focal Shift , Equilateral (Dispersing) Prism

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