Which effect complicates focusing coherent light through fog?

A) Speckle contrast reduction✓

B) Increased Raman scattering

C)Reduced Fresnel diffraction

D)Blue shifting the source

💡 Explanation

Speckle contrast degrades focusing performance because random variations in refractive index in fog induce constructive and destructive interference via the mechanism of random Rayleigh scattering, thus generating speckle, Therefore, increased speckle reduces focus quality rather than promoting it by deterministic diffraction.

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Which effect complicates focusing coherent light through fog?

💡 Explanation

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