what do you understand by penumbra?
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the partially shaded outer region of the shadow cast by an opaque object.
the partially shaded outer region of the shadow cast by an opaque object.2.
the partially shaded outer region of the shadow cast by an opaque object.2.a peripheral or indeterminate area or group.
the partially shaded outer region of the shadow cast by an opaque object.2.a peripheral or indeterminate area or group."an immense penumbra of theory surrounds any observation"
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penumbra is the lighter outer part of a shadow. ... The penumbra is a lighter type of shadow. Like any other opaque objects illuminated by a light source, the Moon and the Earth cast shadows into space as they block the sunlight that hits them.
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