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← ScienceWhich outcome occurs when the path length difference exceeds the coherence length in a Michelson interferometer?
A)Fringe visibility significantly decreases✓
B)Increased laser energy output
C)Polarization shifts orthogonal direction
D)Perfect constructive interference occurs
💡 Explanation
Reduced fringe visibility emerges because the interfering beams are no longer coherent due to exceeding the coherence length, therefore interference fringes become washed out with increasing path difference, rather than maintaining fringe contrast.
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