Do individual photons of light each contain all the colors of the light spectrum or is each single photon a single color?
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A photon can only be a single color. Each photon has one wavelength. A wavelength can only correspond to one color. Light consisting only of 630 nm photons will appear red. Light consisting of 510 nm photons will appear green.
Some colors can only be produced by mixing light of different wavelengths.
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