Question

what do you mean by exams!!??
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Answer 1

Answer:

An "umbra" is the part of the shadow where all of the light from the source is blocked by the shadowing object. A "penumbra" is that region around the umbra where the shadow is only partial, or imperfect. You get these when the light source is larger than a single point.

Answer 2

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An exam is a formal test that you take to show your knowledge or ability in a particular subject, or to obtain a qualification. I don't want to take any more exams.