Definitions for "Chromatic Dispersion"
The dispersion of white light into its constituent colors. The refractive index of blue light is higher than that of red light, resulting in a change of image size from one color to the other.
Spreading of a light pulse caused by the difference in refractive indices at different wavelengths.
The broadening of light pulses caused by the differing propagation speeds of various wavelengths that makes up the pulse (See Refractive Index).