how shadow is formed when extended sorce of light is smaller than the opaque body
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A point source of light casts only a simple shadow, called an "umbra". For a non-point or "extended" source of light, the shadow is divided into the umbra, penumbra and antumbra. ... The outlines of the shadow zones can be found by tracing the rays of light emitted by the outermost regions of the extended light source.
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