having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end.
The researchers tested their new black material with near-infrared radiation, just beyond the red end of the visible spectrum.
having or employing wavelengths shorter than light but longer than X-rays; lying outside the visible spectrum at its violet end.
"Richard of York Gave Battle in Vain," for example, is a mnemonic for recalling the colors of the visible spectrum in the right order (red, orange, yellow, green, blue, indigo, and violet).
When a black body cools down, at some point it no longer radiates light in the visible spectrum, giving off infrared photons instead.
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