Jun 15, 2018

[2.15] For convenience of reference, the electromagnetic spectrum is arbitrarily divided as follows:

Vacuum ultraviolet
       Extreme ultraviolet 10 to 100 nm
       Far ultraviolet 100 to 200 nm
 Middle ultraviolet 200 to 300 nm
 Near ultraviolet 300 to 400 nm
 Visible 380 to 770 nm
 Near (short wavelength) infrared 770 to 1,400 nm
 Intermediate infrared 1,400 to 5,000 nm
 Far (long wavelength) infrared 5,000 to 1,000,000 nm

Note: The spectral limits indicated above have been chosen as a matter of practical convenience. There is a gradual transition from region to region without sharp delineation. Also, the division of the spectrum is not unique. In various fields of science, the classifications may differ due to the phenomena of interest.

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