Do you know the meaning of "Dispersion" in Optics ???

In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency. Media having this common property may be termed dispersive media. Sometimes the term chromatic dispersion is used for specificity.

Although the term is used in the field of optics to describe light and other electromagnetic waves and for telecommunication signals along transmission lines or optical fiber.

                                                         

In optics, one important and familiar consequence of dispersion is the change in the angle of refraction of different colors of light,  as seen in the spectrum produced by a dispersive prism and in chromatic aberration of lenses.

In some applications such as telecommunications, the absolute phase of a wave is often not important but only the propagation of wave packets or "pulses"; in that case one is interested only in variations of group velocity with frequency, so-called group-velocity dispersion.

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