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Water droplet rainbow

Sunlight passes into a round water droplet, bends, and bounces off the inside back. It leaves as a fan of colored rays.

In the picture

  1. White sunlight beam entering the droplet
  2. Front surface of the droplet where light bends
  3. Back inner wall where light reflects
  4. Outgoing rays where colors spread apart

Examples

  • A rainbow after a rain shower
  • A garden hose spray in bright sunlight

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Physics, Age 11