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Why does a shadow have two regions?

Updated: 9/19/2023
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13y ago

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If the source is larger than a single point, then there's a region in the center

of the shadow where the source is completely blocked and none of it is visible,

and another region around the center where only part of the source is blocked

and part of it is visible.

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13y ago
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Q: Why does a shadow have two regions?
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