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Question

Which region is present in the shadow formed by a point source of light?

A
only umbra region
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B
only penumbra region
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C
both umbra and penumbra regions
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D
depends on the distance of source from the obstacle
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Solution

The correct option is A only umbra region
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. A viewer located in the penumbra region will see the light source, but it is partially blocked by the object casting the shadow.

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