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Which phenomenon limits usable fringe visibility using low-coherence interferometry?

A)Increased optical path length difference
B)Decreased source effective beam diameter
C)Elevated environmental vibrational noise
D)Reduced detector quantum efficiency overall

💡 Explanation

Increased optical path length difference affects fringe visibility most because the coherence length defines the maximum tolerable path gap for interference; the self-interference decays quickly therefore, causing fringes to vanish rather than remain weakly discernible.

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