Define umbra and penumbra with the help of diagram
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the central dark region of Shadow is called umbra, the outer less dark region of shadow is called penumbra
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Due to Extended Source , we see two parts in the shadow of the ball on the Screen - One Faint and One Dark .
The faint Part BC Is Called Penumbra .
The Dark Part AD is Called The Umbra .
Simply ,
The penumbra is the Shadow Which is Very Faint
And
The Umbra is the Shadow which is Very dark.
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