define penumbra and umbra.
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The region of complete shadow is called the umbra and the region of diffuse shadow is called the penumbra. These shadows are formed on the Earth during a solar eclipse and From the umbra we see a total eclipse while from the penumbra only a partial eclipse is visible.
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During a Solar Eclipse the dark part of the shadow is the umbra, and the part that is a little lighter is the penumbra. They are the shadow of the Moon formed on the surface of the Earth.
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