Let’s consider this experiment: we have a straight rail with a rocket attached, on the rocket we have two arms (in the same orientation of the track) with a light source in the middle, each arm has at its extreme a light detector, plus we have one stationary detector at each end of the track...
I know you can't see the flash traveling, but let's say you can, and let's say the observer hasn't seen the setup, then from his perspective the light will seem to travel slower than c, because he (like the rocket man) erroneously thinks that the light only traveled up and down the height of the...
And why is that? How are we sure that they'll get the same value?
Let's forget the "stationary" observer and think about the light source, when it fires an impulse a spheric wavefront is originated, in which every point on it is moving away from the point of emission.
If the light source...
Every point on the wavefront is moving at c away from the point of emission. In the video you linked, if the stationary observer looking from the side follows the point of the wavefront that will intercept the mirror, he will see that point traveling at c along the hypotenuse of the triangle...
Light does travel at c from the point of emission, to the observer on the rocket it would just seem to go slower, because he sees only the vertical movement.
If in the rocket I see the light travel up and down in 1ms, while it actually traveled the longer diagonal path, shouldn't I see the light travel at less than c?
I can pour a drink in a train without problem thanks to inertia, the drink and the cup are moving with the train.
The rocket did travel away from the emission point, or the light source and detector would have stayed at the center of the spherical wavefront and would have picked up the light...
From Earth I see the light travel diagonally and measure that it takes 1ms to complete a period. On the rocket I see it going up and down in what I know is 1ms, so from the rocket's perspective it seems that the light traveled a shorter up/down path at less than c, while it actually traveled the...
The light wave is traveling diagonally at c from the point of origin, but from my perspective on the rocket wouldn't it seem to go up and down slower than c?
I get why for the moving clock it takes longer to complete one period, the light has to travel more space at the same speed, but why wouldn't I notice that if I was on the rocket?
The light reached the moving top dot after it reached the stationary one, so it covered more space in more time, where is it that "the time slows down"? If I were in the rocket why wouldn't I be able to tell that it took longer to complete one period?
If the speed at which light waves propagate in vacuum is independent both of the motion of the wave source and of the inertial frame of reference of the observer, why isn't the direction? Shouldn't the light travel directly upward from the point of emission and not diagonally, following the...