Question

write the difference between umbra and penumbra

Answer 1

Hi

1.Umbra is a central cone of darkness whereas penumbra is an outer cone of partial shadow .
2Umbra tapers away from the Earth or Moon and penumbra diverges instead of tapering.

Answer 2

Umbra and penumbra are two different parts of shadow of an object. Umbra is the darker part of the shadow (light is completely obstructed). Penumbra is the less dark part of the shadow (light is partially obstructed). Umbra is the part of the shadow which is exactly behind the obstacle producing the shadow. Penumbra is the part of the shadow on the outer side of the obstacle.