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      Question

      `Short-sight' in human eye can be corrected by using proper โ€“

      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 Earthโ€™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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