Question

Why is a penumbra not obtained from
a point source?​

Answer 1

Question : Why is a penumbra not obtained from a point source?

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.

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Answer 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.