Re: The velocity of light going pass a moving train.

"Dono" <sa_ge@xxxxxxxxxxx> wrote in message
news:1182471434.117285.167600@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Jun 21, 12:58 pm, bz <bz+...@xxxxxxxxxxxxxxxxxxxx> wrote:
Dono <s...@xxxxxxxxxxx> wrote in news:1182450172.908373.143140
@a26g2000pre.googlegroups.com:

Correct, the beam hits the center for the train observer but does not
for the track observer. The reason is that the mirror has moved to the
right while the beam travelled from the floor to the ceiling.

You are ignoring the fact that the trackside observer MUST observe the
beam
hitting the mirror in the exact same place that the observer on the train
sees it hit.

Why would that be, can you prove that the hit location is a frame
invariant?

It is an observed event. We KNOW that the light hits the mirror there.

Individual events do not change because you observe them from another point
of view. SR says that the order that events occur CAN be different .. but
not the events themselves.

That an event happens at a given point in spacetime is a fact .. one can
apply a transform (lorentiz in the case of sr) to see how it would be
maeusred from another FoR .. but it still happens.

ie the light strikes the centre of thet mirror at time t in the frame of the
train. you can apply Lorentz transforms to work out where the centre of the
mirror is in the FoR of the track and what time corresponds to time T in the
FoR of the track .. but the event will still happen.

The two of us disagree when it comes to the value of the aberration
angle, you claim it to be theta, I claim it to be 180-theta.

And you are clearly wrong. Maybe you could go ask your science teacher next
time you're in class to explain classical and relativistic aberration to
you.


.

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