Name two regions of the shadow and define them.
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Umbra and penumbra are the two regions in a shadow. Umbra: is the darkest part of the shadow where the light from the source is blocked by an object. Penumbra: is the art of the light source which is covered partly. They have different amounts of light in them.
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umbra:-The region of complete darkness. no light rays reach here .
penumbra:-The region of partial darkness which surrounded the umbra region. some light rays reach here.
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