A) Corona
B) Umbra
C) Penumbra
D) Black hole
Correct Answer: B
Solution :
The Umbra, penumbra and antumbra are three district parts of a shadow created by an light source after impinging on an opague object. The Umbra is the innermost and darkest part of a shadow, where the light source is completely blocked by the occluding body.You need to login to perform this action.
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