Give scientific reason:In old age, a bifocal lens is necessary for som

1.	Give scientific reason:In old age, a bifocal lens is necessary for some persons.
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.

Give scientific reason:In old age, a bifocal lens is necessary for some persons.

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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Give scientific reason:In old age, a bifocal lens is necessary for some persons.

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