Differentiate between umbra and penumbra.
| Umbra | Penumbra |
|---|---|
| It is the region of total darkness in the shadow. | It is the region of partial darkness in the shadow. |
| The ray of light enters in umbra region. | Some rays of light enter in penumbra region. |
| Umbra is surrounded by penumbra. | Penumbra surrounds the umbra. |