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Question

Given is a diagram showing a defect of human eye.
Study it and answer the following questions :
Name the type of lens used to correct the defect.

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A
Convex
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B
Concave
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C
Bifocal
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D
All of the above can be used
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Solution

The correct option is A $$Convex$$
According to the given diagram, the defect is hypermetropia. Hypermetropia means long-sightedness and is caused when the image of a nearby object is formed behind the retina.  One needs to use a converging lens to correct this defect.
By placing a convex (plus powered) lens in front of a hypermetropic eye, the image is focused correctly on the retina.

Physics

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