Question

state the condition of :
1) Formation of Penumbra only
2) Formation of Umbra and Penumbra both
3) Formation of Umbra alone

Answer 1

Explanation:

1. A "penumbra" is that region around the umbra where the shadow is only partial, or imperfect. You get these when the light source is larger than a single point. These form because while some of the light from the source gets blocked by the shadowing object, not all of it does.

2.An "umbra" is the part of the shadow where all of the light from the source is blocked by the shadowing object. A "penumbra" is that region around the umbra where the shadow is only partial, or imperfect. You get these when the light source is larger than a single point.

3. An "umbra" is the part of the shadow where all of the light from the source is blocked by the shadowing object. ... You get these when the light source is larger than a single point. These form because while some of the light from the source gets blocked by the shadowing object, not all of it does.