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Infrared
Infrared
(
IR
) is invisible radiant energy,
electromagnetic radiation
with longer
wavelengths
than those of
visible light
, extending from the nominal
red
edge of the
visible spectrum
at 700
nanometers
(
frequency
430
THz
) to 1 mm (300
GHz
) (although people can see infrared up to at least 1050 nm in experiments). Most of the
thermal radiation
emitted by objects near room temperature is infrared.
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