(IR) The invisible portion of the electromagnetic spectrum bounded by the long-wavelength extreme of the visible spectrum (about 0.7 um) and the shortest microwaves (about 1000 um). See also frequency, light.
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(IR) The invisible portion of the electromagnetic spectrum bounded by the long-wavelength extreme of the visible spectrum (about 0.7 um) and the shortest microwaves (about 1000 um). See also frequency, light.
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