if water is supposed to be transparent, why does it have a shadow?
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Things are seldom, if ever, absolute. This is one of life’s lessons. It is easy to think of things in binary – yes/no, have/don’t have, 0/1, good/bad etc etc. This is simple but misleading. Most things are measured and exist in a spectrum.
Water is transparent enough that we call it “transparent” but that doesn’t mean it doesn’t affect light at all. It absorbs some, it refracts some and at different angles, it reflects some light etc.
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