Definition: Light is a form of radiant energy emitted from a luminous body. It is a general term referring to electromagnetic radiation in the visible part of the spectrum for humans, ranging approximately from 650 to 900 nm (1 nm =
m). Its electromagnetic waves travel in free space with the speed of
m/s. Like all electromagnetic radiation, light can also be interpreted not only as waves but also as discrete “packets” of energy (quanta) known as photons.
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References: https://doi.org/10.1364/ao.49.000f99
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