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When one sees moonlight reflected from the surface of a lake, if the
water is at all disturbed, the disk is stretched into a line. I've
always thought of this as diffuse reflection from the rippled
surface, and as I think about it, I can't satisfy myself why the
light should be concentrated "beneath" the moon. Why don't the
randomly directed surface ripples make it just as likely that light
hitting off to the side would reflect into our eyes?
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