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Question
why every shadow has a penumbra associated with umbra?
why every shadow has a penumbra associated with umbra?
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Solution
If you place a very big object such that the entire light is blocked out, you will only see the darkest part of the shadow that is umbra. It is when the light is partially blocked that along with umbra penumbra is also seen.
If you place a very big object such that the entire light is blocked out, you will only see the darkest part of the shadow that is umbra. It is when the light is partially blocked that along with umbra penumbra is also seen.
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