___ shadow is called the penumbra.

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Solution

Penumbra is the partially dark part of a shadow.
Penumbra is formed around the umbra which is formed at the center of shadow.

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Write answers the following questions.

(a) Why does an object cast a shadow on a screen?

(b) What is the connection between the formation of shadows and the propagation of light?

(d) When does a solar eclipse take place?

why every shadow has a penumbra associated with umbra?

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