Arm length tolerance in Michelson-Morley interferometer

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exmarine
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Must the two arms of a MM interferometer be equal for fringes to appear? What is the tolerance on that? Would that give the length of the wave packets?
 

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exmarine said:
What is the tolerance on that? Would that give the length of the wave packets?
The tolerance is given by the spatial longitudinal extent of the wavepacket.
 
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