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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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