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Originally Posted by Rockin Robbins
Playing with a simulator that allows you to shine a light beam through the air into water or from water into the air I've learned a few things.
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I don't know as much about it as RR apparently does, but I was going to say something similar. Take a glass of water and a pencil. Stick half of the pencil into the water. It looks bent. It's my understanding that this is how sonar works with various densities and temperatures - it doesn't block it entirely; it just makes it 'look' like it's somewhere else.