Q.

Which of the following eye defects can be rectified by using a convex lens?


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a

Myopia

b

Hypermetropia

c

Presbyopia

d

Cataract 

answer is B.

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Detailed Solution

Hypermetropia can be corrected using a convex lens.
Hypermetropia, also known as long-sightedness, is an eye defect which can be corrected by convex lenses. A person with hypermetropia can see distant objects clearly yet cannot see nearby objects because the image is formed behind the retina and is corrected by convex lenses. A convex lens is used because it is a converging lens and forms the image at the retina by converging the light rays entering the eye.
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