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

Both assertion and reason are true but the reason is the correct explanation of assertion

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Both assertion and reason are true but the reason is not the correct explanation of assertion

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Assertion is true but reason is false

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Both the assertion and reason are false

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Reason is true but assertion is false

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Solution

The correct option is B Both assertion and reason are true but the reason is not the correct explanation of assertion
Stars twinkle because of changing refractive index of atmosphere. As the apparent size (angle subtended at eye) of stars are small, the effect of this change on the direction of rays coming from star is more pronounced and they twinkle.
Stars are much bigger than planets.For example : Sun is a star much bigger than planets.

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Reason (R) : Under a given deforming force, steel is deformed less than rubber.

\to τ = \to r \times \to F b u t \to τ \neq \to F \times \to r .

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