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The surfaces of dry objects are rough and irregular on the micro scale and hence scatter light and have a diffused look. Water or liquids in general, coat over this rough exterior and provide a smooth and uniform surface which reflects light in a focussed manner and the object thus appears darker.

2007-03-17 19:55:13 · answer #1 · answered by ag_iitkgp 7 · 0 0

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