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If a photon travels in the opposite direction as another photon, then what is the speed of the second photon relative to the first. Is it 2 times the speed of light? Also what if two photons travelled on the same direction?

If you answer please include an explanation with formulas if possible which is also easy to understand.

Qmechanic
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Anish Kommireddy
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  • Possible duplicates: https://physics.stackexchange.com/q/11398/2451 and links therein. – Qmechanic Feb 01 '23 at 06:09
  • 2 photons with antiparallel $\vec k$ always move apart at $2c$ in all reference frames. According to the photons: that is not a question, there are no reference frames at $c$. – JEB Feb 01 '23 at 06:22
  • https://en.wikipedia.org/wiki/Velocity-addition_formula can be applied to two objects heading away from each other at nearly the speed of light. – Ghoster Feb 01 '23 at 07:10

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