Correct Answer: Correct answer is: (A) Penumbra.
Exam Relevance: RPSC, UPSC, SSC, Banking Exams
Difficulty: Easy
Concept notes: The penumbra is the lighter, outer part of the shadow where only a portion of the light source is blocked.
Common Mistakes: Students may confuse the penumbra with the umbra, which is the darker, inner part of the shadow where the light source is completely blocked.
Explanations: The penumbra is the lighter, outer part of the shadow where only a portion of the light source is blocked. This is in contrast to the umbra, which is the darker, inner part of the shadow where the light source is completely blocked. Therefore, the lighter, outer part of the shadow is correctly identified as the penumbra.
Option Analysis: - Option A: Correct. The penumbra is the lighter, outer part of the shadow.
- Option B: Incorrect. The umbra is the darker, inner part of the shadow.
- Option C: Incorrect. The penumbra is the correct term, not the umbra.
- Option D: Incorrect. The penumbra is the correct term.
Mnemonic: PENumbra: Partially ENshadowed
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