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How does a mirage work?

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Quick answer

A mirage works when light bends as it passes through air of different temperatures, fooling your eyes. On a hot road, a layer of very hot air near the surface bends light upward, so you see a shimmering 'puddle' that's actually a reflection of the sky.

Step by step

  1. Hot air is less dense than cool air, so light travels through it differently.
  2. Light bends (refracts) as it crosses between the layers.
  3. On hot ground, light from the sky bends up into your eyes.
  4. Your brain interprets it as a reflective puddle on the road.
  5. It's a real optical effect, not an illusion in your mind.

People also ask

Why do mirages look like water?
Light from the sky bends through hot air near the ground into your eyes, so you see a patch of 'sky' on the road that looks like a reflective puddle.
Are mirages real or imaginary?
Real — they're genuine bending of light that a camera can photograph, not a hallucination.
Why do mirages appear on hot roads and deserts?
Strong heating creates a sharp temperature difference between ground-level air and the air above, which bends light the most.

Part of the guide: Water & Weather Phenomena →