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科学为什么·英语30篇(1)

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Why Do We See Mirages on Hot Roads?

Why Do We See Mirages on Hot Roads?

为什么炎热路面上会出现海市蜃楼?

  1. Mirages on hot roads happen because light bends when passing through air layers of different temperatures and densities.
  2. Sun-heated asphalt warms the air just above it, making that layer less dense than cooler air higher up.
  3. Light rays traveling downward from the sky slow slightly when entering denser, cooler air—and bend upward instead.
  4. Your eyes and brain interpret these bent rays as if they came straight from the ground, creating a shimmering ‘pool’.
  5. This lower mirage looks like water because it reflects blue sky light, mimicking a reflective surface.
  6. The effect intensifies on calm, sunny days when temperature gradients near the road are strongest.
  7. Unlike desert mirages, road mirages rarely show distant objects—they mainly distort the horizon and sky.
  8. Drivers sometimes misjudge distance or texture because the brain struggles to process this optical illusion quickly.
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