In old age, a bifocal lens is necessary for some persons. - Vidyadip

Question

In old age, a bifocal lens is necessary for some persons.

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Answer

(1) Some people, in old age, suffer from myopia (nearsightedness) as well as hypermetropia (farsightedness).
(2) Myopia is corrected using a concave lens of appropriate power. Hypermetropia is corrected using a convex lens of appropriate power. Therefore, they need a bifocal lens.

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