Question
Write the differences between umbra and penumbra.
| Umbra | Penumbra |
| $(1)$ It is the darkest part of shadow . | $(1)$ It is less dark part of shadow. |
| $(2)$ No light reaches to this region. | $(2)$ Light from some parts of the source reaches. |
| $(3)$ It is central part of shadow. | $(3)$ It is outerpart of a shadow. |
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