JEE PHYSICS MCQ: RAY OPTICS

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Assertion: The stars twinkle while the planets do not.

Reason: The stars are much bigger in size than the planets.

View answer and explanation

Correct option: B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

Option B (If both assertion and reason are true but reason is not the correct explanation of the assertion) is correct because stars twinkle due to atmospheric refraction, while planets don't because they appear as larger, steadier sources of light. The size difference is not the direct cause of twinkling.

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