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P3D Wavelength

>>Also strictly speaking, infrared and
> ultraviolet energy is not light since it is invisible. Therefore,
> the term "visible light" is redundant.



It is best to think of light in terms of its wavelength. This makes it
easy. The visible part, UV, Infrared, Radio waves and microwaves is all
electromagnetic radiation, as is the light we can see.

RM



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