15.1 The Electromagnetic Spectrum - Physics | OpenStax
https://openstax.org/books/physics/pages/15-1-the-electromagnetic-spectrum
WEBHumans have three cones that are sensitive to three different ranges of electromagnetic wavelengths. They are called red, blue, and green cones, although these colors do not correspond exactly to the centers of the three ranges. The ranges of wavelengths that each cone detects are red, 500 to 700 nm; green, 450 to 630 nm; and blue, 400 to 500 nm.
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