Infrared radiation has the longest wavelengths of the three types of optical radiation: infrared, visible light, and ultraviolet. Its name (“below red”) describes its relation to the spectrum of visible light.
|Name of Band||Range of Wavelengths|
|IR-C||1 000 000 nanometers (1 mm) to 3000 nm|
|IR-B||3000 nm to 1400 nm|
|IR-A||1400 nm to 760 nm|
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Last revised: 3 July 2002.