SSC General Science & Technology Sample Paper NCERT Sample Paper-1

  • question_answer
    The sun remains visible for some time after it actually sets below the horizon. This happens due to:

    A)  Dispersion        

    B)         Atmospheric refraction

    C)  Scattering of light

    D)           Persistence of vision

    Correct Answer: B

    Solution :

    [b] The time of sunset is defined in astronomy as the moment when the trailing edge of the Sun's disk disappears below the horizon. Near to the horizon, atmospheric refraction causes the ray path of light from the Sun to be distorted to such an extent that the Sun's disk is already about one diameter below the horizon when sunset is observed.

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