- #1

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- TL;DR Summary
- Problem of comprehension in the method of calculation.

When we derive the formula of the redshift by the equivalence principle we imagine a light ray which goes from the bottom to the top of the elevator and which would take a duration t = h/c to make the journey, with h = height of the elevator. I don't understand why t = h/c, because while the ray goes from one partition to the other the elevator goes on, and the light therefore has a greater distance to travel than h.