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Question

Convex lens is used to correct

A
Hypermetropia
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B
Myopia
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C
Cataract
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D
Glaucoma
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Solution

The correct option is A Hypermetropia
A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly. The near point, for the person, is farther away from the normal near point (25 cm). This defect arises either because (i) the focal length of the eye lens is too long, or (ii) the eyeball has become too small. This defect can be corrected by using a convex lens of appropriate power. Eye-glasses with converging lenses provide the additional focussing power required for forming the image on the retina. Thus, the correct option A.

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