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What are the parts of a shadow?

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There are three:

  • The penumbra is the part of a shadow where the surface is only partially covered by an object. Parts of the edge of the light source cannot be seen, to differentiate from antumbra.
  • The umbra is the part of a shadow where the surface is fully covered by an object.
  • the antumbra is the part where the object is merely a little obstruction from the light source when seen from the surface. The edge of the light source can be seen in full from the surface.

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