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B
Concave lens
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C
Cylindrical lens
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D
Toric lens
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Solution
The correct option is B Concave lens
Myopia is a vision condition, in which a person can see nearby objects clearly but objects farther away appear blurry. Hence the far point of the eye is reduced.
So to cure this , we should use a lens of focal length f such that it forms the image of objects at infinity at the distance of the far point of the person.
Hence, applying the lens' formula
In myopia, u=∞,v=−d= distance of far point By 1F=1v−1u, we get f=−d Since f is negative, hence the lens used is concave.