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Infrared
The term "infrared" refers to a broad range of frequencies,
beginning at the top end of those frequencies used for communication
and extending up the the low frequency (red) end of the visible
spectrum. The wavelength range is from about 1 millimeter down to 750
nm. The range adjacent to the visible spectrum is called the "near
infrared" and the longer wavelength part is called "far infrared". |
