Dispersive medium

A dispersive medium is a medium in which waves of different frequencies travel at different velocities.[1] With electromagnetic radiation (e.g. light, radio waves), dispersion corresponds to a frequency-dependent variation in the index of refraction of the medium.

References
  1. Samiullah, Mohammad (2015). A first course in vibrations and waves. New York, NY: Oxford University Press. p. 211. ISBN 978-0-19-872979-2.
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