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← ScienceWhich outcome reduces fringe contrast on coated optics?
A)Increased substrate thickness variation✓
B)Reduced coating material dispersion
C)Higher refractive index homogeneity
D)Improved surface flatness accuracy
💡 Explanation
Increased substrate thickness variation causes varied optical path lengths, therefore reducing constructive and destructive interference of reflected light, which is the mechanism causing fringe patterns, rather than other options maintaining interference.
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