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  1. A star appears twinkling in the sky because of

    2. A.

     Scattering of light by atmosphere
    B.

     Reflection of light by atmosphere
    C.

     Refraction of light by atmosphere
    D.

     Diffraction of light by atmosphere

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    Answer : Option C

    Explanation :

    A star appears twinkling in the sky because of refraction of light by atmosphere.

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