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    Question

    Stars in the sky appear to twinkle due to

    –
    A a series of refractions Correct Answer Incorrect Answer
    B a surface tension phenomenon Correct Answer Incorrect Answer
    C a series of reflections Correct Answer Incorrect Answer
    D multiple diminishing brightness Correct Answer Incorrect Answer

    Solution

    The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.

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