Polychromatic

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Polychromatic is used to described light that exhibits more than one colour. In a technical respect, this can also mean that it contains radiation of more than one wavelength.

The effect of Polychromatic light can be seen on the iridescent reflections on the underside of a Compact Disc (CD)
The effect of Polychromatic light can be seen on the iridescent reflections on the underside of a Compact Disc (CD)

The study of Polychromatics is particularly useful in the production of diffraction grating.

For an etymological reference on the term, visit Reference.com's definition.