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Q: Why is our vision blurred underwater?
Physicist: The speed of light depends on the medium it moves through. Because light is a little spread out, speeding up or slowing down can make it change direction. When the boundary between mediums is slanted, one side of the wave changes speed first, causing the wave to “swing around”. This change in direction is called “refraction”. All lenses use refraction to change the direction of light.
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