Glossary: U

Ultraviolet (UV) Spectrum

The wavelength interval of the electromagnetic spectrum that corresponds to ultraviolet light (light that is beyond the visible violet range). UV radiation is often divided into three smaller regions: 320 - 400nm, 280 - 320nm, and 100 - 280nm – defined as UV-A, UV-B, and UV-C, respectively.


Characterization of light that contains random combinations of x and y components of the electric field. Light from sources such as incandescent and fluorescent bulbs, LED spotlights, fiber optic illuminators and sunlight are all examples of unpolarized light.

  See also Polarization

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