Give reasons.
In old age bifocal lens is necessary for person.

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Solution

In old age, sometimes person suffers both myopia and hypermetropia and then the person needs bifocal lens. In bifocal lens, upper part is concave lens to correct myopia and lower part is convex lens to correct hypermetropia.

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Similar questions

Give reasons:

(1) You cannot enjoy watching a movie from a very short distance from the screen in a cinema hall.

(2) A simple microscope is used by watch repairers.

(3) A concave lens is used to correct myopia.

(4) In gold age bifocal lens is necessary for some person.

(5) Concave mirrors are used in solar devices.

For what kind of defect a person is asked to wear bifocal lens

Column 1	Column 2	Column 3
Farsightedness	Nearby object can be seen clearly	Bifocal lens
Presbyopia	Far away object can be seen clearly	Concave lens
Nearsightedness	Problem of old age	Concave lens

A bifocal lens is used for the correction of ____. The upper part of the bifocal lens is a ____ lens and the lower part is ____.

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