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← ScienceWhich effect reduces fringe visibility when using incoherent interferometer illumination?
A)Reduced temporal coherence length✓
B)Increased optical path difference
C)Greater source wavelength stability
D)Improved spatial mode confinement
💡 Explanation
Decreased temporal coherence shortens the distance over which interference is possible; fringe visibility decreases because interference only occurs where paths differ less than the coherence length. Therefore, resolution degrades, rather than the improved resolution or confinement arising from greater stability or mode confinement.
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