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so IR is invisible to the human eye. IR is generally (according to ISO, CIE) understood to include wavelengths from around to . IR is commonly divided between longer-wavelength thermal IR, emitted from terrestrial sources, and shorter-wavelength IR, or near IR, part of the solar spectrum. Longer IR wavelengths (30-100 um) are sometimes included as part of the terahertz radiation band. Almost all black-body radiation

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