A shadow is a region where light from a light source is obstructed by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or reverse projection of the object blocking the light.
Intro Point and non-point light sources Astronomy Daytime variation Propagation speed Color Photography Three-dimensional shadows Shadow inversions Analogous concepts Cultural aspects Gallery See also References External links
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