What is the speed of a photon with respect to another photon if (a) the two photons are going in the same direction and (b) they are going in opposite directions?
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Relative velocity of a photon with respect to another photon will be 0, when they are going in the same direction. Thus, the relative velocity of a photon with respect to another photon will be equal to the speed of light when they are going in opposite directions.
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