Now I understand. I was just mixing things. Thank you very much for your very clear explanation. The main point I was missing was relativity of simultaneity.
Thanks Orodruin and Ibix for your responses.
As for Orodruin reply, I cannot see the difference between, using your words “the time elapsed on the clock of a moving observer relative to the coordinate time of a frame…” and the situations where (1) time of the event “the light beam arrives to...
Hello everyone,
I would be thankful ir someone explained where I am mistaken in this reasoning on Einstein’s mental experiment on Special Relativity.
Taking the railway as K reference frame, a light beam is thrown in the x positive direction the moment the train passes in the same positive...