Question

what is a definition of shadow?​

Answer 1

Answer:

A shadow is a dark (real image) area where light from a light source is blocked 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 a reverse projection of the object blocking the light.

Answer 2

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What is a definition of shadow?

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A shadow is actually just a space or region, where there is no light since an opaque object is blocking light rays. If it is a point source of light, then it forms a simple shadow called an umbra. If it is an extended light source, the shadow is divided into the umbra, penumbra, and antumbra.