B Michelson-Morley Exp: Laws of Reflection Explained

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Michelson-Morley Exp..png
Hello there,
I have a problem with this image from the Michelson Morley experiment in which one tries to calculate the time taken by the light beam to traverse the arm of interferometer perpendicular to the velocity of the frame in 'ether'.
So the problem is, Are laws of reflection being followed where the light beam encounters the first mirror?. The angle of incidence does not appear to be equal to the angle of reflection.
Any comments...
 

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The mirror is moving, in the reference frame of the mirror the reflection leaves under the angle you would expect.
 
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mfb said:
The mirror is moving, in the reference frame of the mirror the reflection leaves under the angle you would expect.
meaning, the laws of reflection are valid in the mirror frame of reference.
 
Right. This reference frame is the lab frame, where we can check that the reflection works as expected.
 
Thanx:smile:
 

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