what should be the nature of the source of light for the formation of both umbra and penumbra
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There is usually a dark part on the inside and a lighter part around the edges of a shadow. An umbra is a total shadow. It is formed when an object blocks all the light from a light source. ... The penumbra can be formed when light from one source is blocked with light from another source filling in some of the shadow.
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There is usually a dark part on the inside and a lighter part around the edges of a shadow. An umbra is a total shadow. It is formed when an object blocks all the light from a light source. ... The penumbra can be formed when light from one source is blocked with light from another source filling in some of the shadow.
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