I need a start on this Physics problem due in two days

Nov 2018
***Will update from this thread on attempts

really hope the lovely community here can first give me a push and see what I've got

PROBLEM: This light path for the Michelson–Morley experiment was described at the different inertial frames as follows: for the moving coordinate system, the angle of incidence is equal to the angle of reflection when the first encounter with mirror. However for the observer at rest, the angle of incidence is not equal to the angle of reflection.
This obviously violates to the first postulate of SR, “the principle of relativity” : The laws of physics are the same in all inertial reference frames. No one frame is preferred over any other.

Please discuss and infer if this diagram is reasonable or wrong ……If you believe it is not correct, please draw the rational picture you think is logical.

*Attachment is the diagram


Jun 2016
If "observers" in the two reference frames measure the angles
would they get the same result?
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