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Which image degradation results when partial coherence illuminates objects?

A)Speckle patterns reduce apparent resolution
B)Chromatic aberration distorts true colors
C)Astigmatism blurs off-axis features
D)Vignetting darkens the image corners

💡 Explanation

Speckle arises when partially coherent light interferes at the image plane via constructive and destructive interference, because the surface roughness introduces variations in phase. Therefore, speckle compromises resolution rather than chromatic aberration, which stems from variations in refractive index.

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