Dictionary:Infrared

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The part of the electromagnetic spectrum with wavelengths between those of visible light and 10–3 m; see Figure E-11. Near infrared is 0.7–1.3 μm, middle infrared 1.3–3.0 μm, and thermal infrared 3.0–20.0 μm (but atmospheric absorption limits the useful range to an 8–14 μm window).