# Professor B Link and his 2 experiments

Simplex0
Joined: 1 Sep 05
Posts: 152
Credit: 964,726
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Topic 193376

Professor B Link who is locatet at A is on his way to carry out 2 experiments to determine how light moves. The first set up is as follow.

A laser beam is emitted from the location A towards the 10 mm, wide mirror located at B. The distance between A and B is 2 light years and after the light have traveling 0.5 light year it passes trough the front end of the window of a 1 light year long and 1 light year wide rocket and after flying a cross the rocket it exits trough the front end of the window at the opposite side, the windows has the same length as the rocket, and hit the mirror at location B after 2 years have elapsed. The location A, the rocket, and location B is stationary with respect to each other. On board the rocket is Dr. C Fused and he mark the position where the light enters and exit the rocket which is at the front end of each window.

After a short lunch they decide to continue with experiment 2 in which A still is stationary to B but the rocket moves perpendicular to the line between A and B and with a speed of 0.5 c relative A and B. The light is emitted so it enters the rocket trough the front end of the window at the same location as in the first experiment according to Dr. C Fused who marks the position of enter and exit points again and Professor B Link is observing.

In both experiments Professor B Link observe where Dr. C Fused mark the enter and exit points with a telescope and he can confirm that the light hit the mirror at location B in the first experiment.

Will Professor B Link see that the laser beam hit the mirror in the second experiment?

Will Professor B Link and Dr C Fused have the same opinion of where the light enter end exit the rocket in the second experiment?

Simplex0
Joined: 1 Sep 05
Posts: 152
Credit: 964,726
RAC: 0

### Professor B Link and his 2 experiments

The second question in my first post regarded the location relative to the rocket.

Will the exit point of the light beam in the rocket be at the same location relative the rocket in the second experiment as in the first experiment? According to the assumption that Special relativity sates that the "laws of physics" are the same in any non-accelerating (inertial) frame it should be but if that is the case the light beam should not be able to hit the mirror at location B which is a non-accelerating (inertial) frame with respect to A unless the light passes across the rocket with infinite speed observed by the observer at A. So if NOT the light beam is traveling across the rocket with infinite speed observed by Professor B Link in the second experiment it should not be able to hit the mirror at location B and therefore A can not be regarded as a non-accelerating (inertial) frame with respect to B despite the fact that it is. Do you see the logical contradiction here?

I hope that you find this formulation of the question less confusing than I am feeling right now. :)

Simplex0
Joined: 1 Sep 05
Posts: 152
Credit: 964,726
RAC: 0

### I have only one logical

I have only one logical conclusion to this.

The lights movement is dependent on the movement of the light source. Is that correct according to the knowledge of today?