Why penumbra is not obtain from point source? ans in short but meaningful
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The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. · If you aim a light source directly at an object, the blackest portion of the shadow directly behind the ... The penumbra is not a true shadow.
shanaya116:
i can't understand ur ans will you explain
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A "penumbra" is that region around the umbra where the shadow is only partial, or imperfect. You get these when the light source is larger than a single point. These form because while some of the light from the source gets blocked by the shadowing object, not all of it does.
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