What Makes a Shadow Have Shape?

Shadows get their shape from the light around them. Imagine you're holding up a toy dinosaur in front of a lamp, the shadow looks like a dinosaur because the light is hiding parts of it. If the light comes from one side, the shadow stretches out on the other side. It's like the light is drawing a picture of what it can't see.

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Examples

  1. A pencil casts a long shadow on the floor when the light is low.
  2. Your friend’s shadow looks like a big rectangle if they're standing near a wall.
  3. A dog's tail makes a thin part in its shadow when it wags.

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Categories: Physics · optics· light· shadow