Question

Explain the difference:

Umbra and penumbra.

Answer 1

Sr. No.	Umbra	Penumbra
1.	It is the part of the shadow where all of the light from the source is blocked by the shadowing object.	It is the region around the umbra where the light from the source is partially blocked by the shadowing object.
2.	The umbra is obtained from a point source as well as an extended source of light.	The penumbra is obtained only from an extended source of light.