Dispersion in optics - the dependence of the refractive index of the center frequency of the light wave. One effect of dispersion is that the how to lose weight fast light beams of different colors, falling on the border of centers in terms different from zero, refracted at different angles. This effect can be observed when white light falls on the prism and is split on the colors of the rainbow.

Refractive index results from the speed of propagation of light in the center. In optics, the dispersion is also considered the dependence of the propagation of light on other factors such as waveguide dispersion is determined fashion in which the speed of traffic along the waveguide mode depends on the road in the waveguide.

The dependence of the refractive index of the wavelength of light is called the coefficient of dispersion and is the parameter determining the properties of minerals. Minerals with high dispersion, respectively polished sparkle with different colors as a result of the splitting of white light.

The dispersion in optics is a special case of a more general phenomenon of wave dispersion, which means the wave phase velocity dependence of its frequency, and hence the length. The resort niedyspersyjnym where this relationship is not present, the wave phase velocity is equal for all wavelengths and is equal to the group velocity. An example of the non-propagation of light is electromagnetic wave propagation in a vacuum.

For almost any material, the propagation of light is dispersed.