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Q.

Is it true that the planets twinkle?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is False.
The planets are very far from the earth as compared to stars. That is why diffraction of light does not occur much and we cannot see the planet twinkling.
Planets are seen as extended sources. Light reflected from different parts of the planet from an extended image at the eye and the total variation in the amount of light entering our eye averages out to zero.
Therefore planets do not twinkle.
   
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