If the distance of the far point for a myopia patient is doubled, the focal length of the lens required to cure it will become
A
Half
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B
Double
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C
The same but a convex lens
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D
The same but a concave lens
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Solution
The correct option is B Double Focal length = −( Detected far point )
For curing myopia, a concave lens of focal length equal to the distance of the eye’s own far point is used. i.e. f=−d Hence, if distance d is doubled, then the focal length will also be doubled.