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In old aget a bifocal lens is necessary ...

In old aget a bifocal lens is necessary for some persons. Give reason

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(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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