Small point of difference between umbra and penumbra
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Umbra:-
1.The umbra is the portion of a shadow from within which none of the light source is visible.
2.Umbra is the area of total shadow.
3.The umbra is the middle part of the shadow.
Penumbra:-
1.The penumbra is the portion of a shadow from within which part but not all of the light source is visible.
2.Penumbra is the area of partial shadow.
3.The penumbra is the outer part of the shadow.
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