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Dispersion can mean any of several things:

  Results from FactBites:
Dispersion (optics) - Wikipedia, the free encyclopedia (1216 words)
In optics, dispersion is a phenomenon that causes the separation of a wave into spectral components with different frequencies, due to a dependence of the wave's speed on its frequency.
The overall dispersion of the optical resonator is a major factor in determining the duration of the pulses emitted by the laser.
In the technical terminology of gemology, dispersion is the difference in the refractive index of a material at the B and G Fraunhofer wavelengths of 686.7 nm and 430.8 nm and is meant to express the degree to which a prism cut from the gemstone shows fire or color.
DISPERSION - LoveToKnow Article on DISPERSION (2350 words)
As the light is twice refracted, the dispersion is increased, and the rays, after transmission through the prism, form a divergent system, which may be allowed to fall on a sheet of white paper, forming the wellknown solar spectrum.
Dispersive Power.In order to find the amount of dispersion caused by any given prism, the deviations produced by it on two rays of any definite pure colors may be measured.
By studying the dispersion of colors in water, turpentine and crown glass Newton was led to suppose that dispersion is proportional to refraction.
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