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Physics

Penumbra is a region of :

  1. complete darkness
  2. complete brightness
  3. partial brightness
  4. none of the above

Light Energy

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Answer

partial brightness

Reason — Penumbra is the portion of shadow where a portion of light from the source of light reaches the shadow even in the presence of the opaque object in between them. It is not completely dark, but is dim (or less bright).

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