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    Question

    `Short-sight' in human eye can be corrected by using

    proper –
    A convex lens Correct Answer Incorrect Answer
    B concave lens Correct Answer Incorrect Answer
    C cylindrical lens Correct Answer Incorrect Answer
    D bifocal lens Correct Answer Incorrect Answer

    Solution

    Scintillation or twinkling is generic terms for variations in apparent brightness or position of a distant luminous object viewed through a medium. If the object lies outside the Earth’s atmosphere, as in the case of stars and planets, the phenomenon is termed astronomical scintillation; within the atmosphere, the phenomenon is termed terrestrial scintillation.

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