Why is a penumbra not obtained from
a point source?
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Answered by
2
Answer:
We do not obtain penumbra from a point source because all the light rays falling on the shadowing object are completely blocked by it.
Answered by
3
Answer:
Penumbra is not obtained from point source because scattering of light emerging from a point source does not takes place .Thus, only dark shadow of the object placed in )front of the point source is obtained. The shadow obtained from a point is mainly called Umbra .
Umbra - Dark part of the shadow.
Penumbra - Light part of the shadow.
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