Question

a region of partial darkness in a shadow​

Answer 1

Answer:

The region of deep, total shadow is called the UMBRA and the region of partial shadow is called the PENUMBRA. ... The umbra is a region where no light can get to while the penumbra is a region where some light can reach.

Answer 2

Answer:

A region of partial darkness in a shadow is called as penumbra .

Extra information:

▪︎The region of the shadow in which full of darkness is called as umbra .

▪︎If the moon is in the penumbra of the earth shadow at the time of lunar eclipse causes the partial lunar eclipse . And of the moon came at the region of umbra of the earth shadow it is called as Total Lunar eclipse .

Experiment:

To see the penumbra and the umbra of an opaque object -:

Things taken -:

• Ball

• Torch

Procedure -:

▪︎Go to a dark room and place the ball on the table

▪︎Now , light with the torch to the ball .

Conclusion -:

You will see the penumbra and the umbra of the ball of the wall .