What is meant by umbra and penumbra?
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Umbra is the shadow of a dark area where light from a light source is blocked by an opaque object.
Penumbra is the partially shaded outer region of the shadow cast by an opaque object
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(i) Umbra means ''shadow'' while ''penumbra'' means to hang on the shadow or almost a shadow. ... The outer shadow of the earth falls on the moon during a penumbral lunar eclipse
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