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Farsightedness (hypermetropia) is corrected by spectacles using which type of lens, carrying which sign of power?
AConvex lens, positive power
BConcave lens, negative power
CConvex lens, negative power
DConcave lens, positive power
Answer & Solution
Correct answer: A. Convex lens, positive power
1. Hypermetropia needs extra convergence so the image moves forward onto the retina.
2. A convex lens converges incident rays and has a positive focal length.
3. Hence the corrective lens is convex with positive power, matching option A.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 7 "Lenses", p.98_
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