500
600
700
750
650
550
450
400
Each of the “colors” of visible light has a
corresponding wavelength
between 400 to 700 nanometers (or nm).
Is this because the eye has a specific detector (or
receptor) for 565 nm yellow light?
And a different receptor for 450 nm blue light? And another one for 650 red-orange
light?
And so on, for every wavelength between 400 and 700
nm?
Seems like that would be a LOT of different types of
receptors.
Nature is “smarter” —and more efficient—than that.
Only three different receptors for visible light are
used.
565 nm
Light having
a wavelength of near 565 nm will look
yellow to most people.