Umbra, penumbra and antumbra

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Notion

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Science and technology

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What Wikipedia says

The umbra, penumbra and antumbra are three distinct parts of a shadow, made by any light source after impinging on an opaque object of lesser size. In cases of equal or larger impinging objects, only an umbra and penumbra are generated.

Excerpt from the Wikipedia article “Umbra, penumbra and antumbra”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Vectorised by User:Sushant savla from the work by Guiral LACOTTE, CC BY-SA 3.0, via Wikimedia Commons.