Question
Write the differences between umbra and penumbra.

Answer

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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