Dispersion

• A phenomenon that causes the separation of a wave into components of varying frequency. See dispersion (optics).
• The fraction of atoms of a material exposed to the surface. See dispersion (materials science).
• In the technical terminology of gemmology, the difference in the refractive index of a material at the B and G Fraunhofer[?] wavelengths of 686.7 nm and 430.8 nm. Simply, the degree to which the gemstone shows fire or color. See Abbe number and dispersion (optics).
• Statistical dispersion.

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