十万个为什么·科学阅读30篇（3）
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Why Do We See Mirages on Hot Roads?
为什么炎热的路面上会出现海市蜃楼？
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On hot days, roads sometimes look wet or shiny.
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This is not real water—it’s a mirage.
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Hot air near the road bends light rays upward.
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Our eyes think the light comes from the ground.
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So we see a blue patch that looks like water.
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Mirages happen because light travels at different speeds in hot and cool air.
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They often appear in deserts too.
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It’s nature’s light trick—not magic or illusion.