Heather put a straw in a glass of water. When she looked at the side of the glass she observed that the straw appeared larger and also appeared to be broken. Why did it appear this way?
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Above the water, the light reflects from the straw through the air and glass to your eyes. But below, when the light also travels through water, the refraction causes the image of the straw to be in a slightly different location. ... To the brain, the straw appears broken (and bloated).