Differentiate between umbra and penumbra.

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Umbra
Penumbra
1.The portion of the shadow which is completely dark is called the umbra. 1.While the penumbra is the portion of the shadow which is partially dark.
2.Umbra is the darkest part of the shadow and is located centrally. 2.While penumbra is not the darkest part of the shadow.
3.The umbra is centrally located in the shadow. 3.While the penumbra is formed at the edge of the shadow due to the diffraction of light.
4.No light reaches this region. 4.Some light rays always reach this region.

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Umbra	Penumbra
1.The portion of the shadow which is completely dark is called the umbra.	1.While the penumbra is the portion of the shadow which is partially dark.
2.Umbra is the darkest part of the shadow and is located centrally.	2.While penumbra is not the darkest part of the shadow.
3.The umbra is centrally located in the shadow.	3.While the penumbra is formed at the edge of the shadow due to the diffraction of light.
4.No light reaches this region.	4.Some light rays always reach this region.