Chromatic dispersion refers to the way that light, under certain conditions, separates into its component wavelengths and the colours corresponding with each wavelength become visible to a human observer.
- Chromatic dispersion refers to dispersion according to colour.
- Chromatic dispersion is the result of the relationship between wavelength and refractive index.
- When light propagates from one medium (such as air) to another (such as water) every wavelength is affected to a different degree according to the refractive index of the media concerned. There result is that each wavelength changes direction to a different degree. In the case of a light source producing white light, the separate wavelengths fan out with red on one side and violet on the other.
- A familiar example of chromatic dispersion is when white light strikes raindrops and a rainbow of colours become visible to an observer.
- As light first enters and then exits each raindrop, it separates into its component wavelengths which the observer perceives as distinctly separate colours.
- Remember that wavelength is a property of electromagnetic radiation, whilst colour is a feature of visual perception.
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