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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.