What are infrared rays?
Infrared rays are waves of invisible radiant energy, like the visible waves of sunlight that travel, or radiate from the sun.
Infrared rays the lie outside the visible spectrum at its red end. These rays are “redder” than the reddest light our eyes can see, so they are called infrared, meaning “below the red.”
Infrared rays are often called “heat rays.” They are given off by all warm objects. Infrared (heat) rays radiate from the hot coals in the fire place, as well as from the sun.
Electric lamps called “heat lamps” produce heat with a special healing filament that sends out infrared rays instead of visible light. Doctors use infrared heat lamps to treat skin disease and to relieve the discomfort of sore muscles.
The name “black light comes from the use of infrared light in photography. The rays are so penetrating that photographers take pictures in total darkness with films sensitive to infrared rays.
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