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A person suffering from both nearsightedness and farsightedness is given bifocal lenses. What is the correct arrangement of the two parts of such a lens?
AUpper part convex, lower part concave
BUpper part concave, lower part convex
CBoth parts concave throughout
DBoth parts convex throughout
Answer & Solution
Correct answer: B. Upper part concave, lower part convex
1. The upper part of a bifocal lens is concave and corrects nearsightedness (distant viewing).
2. The lower part is convex and corrects farsightedness (near viewing such as reading).
3. So the arrangement is upper concave, lower convex, matching option B.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 7 "Lenses", p.98_
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