Old English lēoht, līht (noun and adjective), līhtan (verb), of Germanic origin; related to Dutch licht and German Licht, from an Indo-European root shared by Greek leukos‘white’ and Latin lux ‘light’.
What is light?
The form of radiant
energy that stimulates the organs of sight, having for normal human vision
wavelengths ranging from about 3900 to 7700 ångstroms and traveling at a speed
of about 186,300 miles per second.is known as light.
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