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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Photons don’t really have colour they are particles/waves that vibrate/propagate at a frequency. The more energy a photon has the more it vibrates. We perceive this vibration as colour with low frequency looking red and high being blue. Each photon has its own single energy so represents only one colour.
It is interesting to note that not all colours represent a frequency of photon brown and pink are our brains combining multiple photos.
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