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Which outcome occurs when a diffraction filter's aperture exceeds coherence length?

A)Reduced fringe visibility through intensity fluctuations
B)Increased monochromaticity without wavelength dependence
C)Polarization shift along optic axis tilting
D)Enhanced filter focusing onto interference points

💡 Explanation

Reduced fringe visibility results when the coherence length becomes smaller than the aperture because self-interference is disrupted. The **decoherence** introduces random phase variations; therefore, intensity fluctuations arise, rather than improved monochromaticity because coherence is a condition to produce stable interference.

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