Q.

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

A. convex lens
B. concave lens
C. cylindrical lens
D. bifocal lens
Answer» B. concave lens
Explanation: 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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