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For example, if I toss a baseball on a moving train, the ball appears to go straight from my point of view because the velocity of the train is added to that of the ball so it stays in my train-frame with me.But how does this work for light? What happens with a laser or a single photon. If I bounce a beem of light back and forth between mirrors on a smoothly moving train, why don't the mirrors immediately move away from the light? (I understand the train would have to be going very very fast.)
My question is that unlike the situation where I am trying to aim a laser at Pluto, if I am aiming the laser at a mirror opposite me on the moving train, I don't have to anticipate where the mirror will be when the light hits it.
(I realize I am assuming a very large train). What I don't understand is why. In the case of tossing a baseball, I know that I am imparting the velocity of the train to the velocity of the baseball. The motion of the train does not affect the speed of light but it does affect the direction. I suppose its futile to ask HOW the movement of the source could affect the direction of light but I think that is what is troubling me.