Assertion: The stars twinkle while the planet | vedclass

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(B) The twinkling of stars is due to the atmospheric refraction caused by the changing refractive index of the atmosphere.Stars appear as point-sized

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If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

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(B) The twinkling of stars is due to the atmospheric refraction caused by the changing refractive index of the atmosphere.Stars appear as point-sized sources because they are very far away. Due to the small apparent size,the fluctuations in the path of light rays are significant,leading to the twinkling effect.Planets are much closer to the Earth and appear as extended sources (collection of many point-sized sources). The total variation in the light coming from all these point sources averages out to zero,so they do not twinkle.The Reason provided states that stars are bigger than planets,which is a fact,but it is not the reason why stars twinkle and planets do not. The actual reason is the difference in their apparent size (point-sized vs. extended source).

Assertion: The stars twinkle while the planets do not.
Reason: The stars are much bigger in size than the planets.

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Assertion: The stars twinkle while the planets do not.Reason: The stars are much bigger in size than the planets.