Color is the way we perceive different
wavelengths of light. Light travels in waves, and
waves have a property called wavelength, which is
the distance from peak to peak of the wave.
Visible light ranges from 400 to 700 nanometer
wavelengths (a nanometer or nm is one billionth of
a meter). Violet light starts at about 400 nm and
the visible spectrum includes the colors of the
rainbow and ends with red light at about 700 nm.
The diagram below shows which colors correspond
to which wavelengths. I took this image from
here for image
When a color of light enters our eyes, cells in
our eyes can detect it and send a signal to our
brains telling us what color we see.
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