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But typical bodies of water are blue because water is a selectiveabsorber -
I don't know if this is true. "Typical" bodies of water, i.e. the ocean,
are blue because of impurities.
***Not true ... or as John Denker would say, "What is your evidence for
this?"
Last time this debate appeared on phys-L, I said what I'll say now: the
swimming-pool reactor at Cornell looked very odd, it did not look the
color of swimming-pool water. The walls of the tank were not painted
blue, and there were underwater floodlights.
*** If there were underwater floodlights, then the path length of light
passing through water and then entering your eye is certainly less than the
depth of the pool.
Also: nearly all the swimming pools I've seen have been painted sky blue.
*** I highly doubt it. It is difficult to tell the color of pools from an
aircraft.
***For an example, take a look at an empty and filled pool at:
http://www.sci-ed-ga.org/pdfs/apsclrpres042501.pdf
slides 44 and 45.