What is the speed of photon with respect to another photon if the two photons are moving in opposite direction?
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The speed of light, (or the speed of a photon) in a near-perfect vacuum is exactly 186,282 miles per second. We perceive photons (light) traveling at this speed because they are massless, or have no 'weight' (but they do have kinetic energy, more on that in a bit).
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