What is infrared?

Infrared is invisible radiant energy, electromagnetic radiation with longer wavelengths than those of visible light.

Infrared radiation was discovered in 1800 by the astronomer Sir William Herschel, who discovered a type of invisible radiation in the spectrum lower in energy than red light. He discovered this by noticing its effect on a thermometer.

Infrared radiation is used in industrial, scientific, and medical applications. For example, night-vision devices using active near-infrared illumination allow things to be observed without the observer being detected.

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