Question

define umbra with an example​

Answer 1

Explanation:

the umbra is the darkest part of the shadow...

example,a lunar eclipse occurs only when the moon is full and when it passed through part of the earth's shadow.

Answer 2

Answer:

the umbra is the innermost and the darkest part of a shadow where the light source is completely blocked by the concluding body .

the umbra of a round body around light source forms a right circular cone .

hope it helps u