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Which consequence results when tolerances cause microscopic surface height variations in an interferometer?

A)Spurious harmonics dominate the signal
B)Signal fringes distort and blur
C)Overall phase shift reaches zero
D)Effective beam expands indefinitely

💡 Explanation

Signal fringes distort and blur because microscopic surface height variations result in variations of effective pathlength in different regions—in other words, *destructive interference*; therefore, fringes aren't sharp lines, rather than distinct phases because signal noise smears the contrast.

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