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Which outcome arises when coating thickness varies in spectral interferometry?

A)Reduced fringe visibility appears locally
B)Reflected intensity becomes wavelength-independent
C)Spatial coherence length increases sharply
D)Complete destructive interference for average coating

💡 Explanation

Variation in coating thickness causes localized differences in optical path length. Therefore the interference fringes become less distinct due to decreased temporal coherence, because fringe visibility depends on path length matching, rather than uniform intensity changes or length increases.

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