infrared radiation

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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