Recent content by Big_E_Pat

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    Undergrad What causes the shadow below a whirlpool in a pool?

    Hi there, I have noticed that when the wadding pool I work at is draining, a small whirlpool appears over the drain in the center of the pool. When the sun is shining a shadow appears at the bottom of the pool(2.5-3 feet deep) below the whirlpool. The shadow is larger than the whirlpool...