Topic
penumbra.
partial shadow between the entirely dark and fully illuminated spaces that is generated during eclipses
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About penumbra
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. Assuming no diffraction, for a collimated beam of light, only the umbra is cast.
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