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Nearsightedness (myopia) is corrected using spectacles. Which type of lens, and hence which sign of power, is required?
AConvex lens, positive power
BConcave lens, negative power
CConvex lens, negative power
DConcave lens, positive power
Answer & Solution
Correct answer: B. Concave lens, negative power
1. Myopia is corrected by diverging the incident rays before they reach the eye lens.
2. A concave lens diverges rays, and its focal length is negative.
3. So the corrective lens is concave with negative power, matching option B.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 7 "Lenses", p.97_
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