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  4. If the distance of the far point for a myopia pa dent is doubled, the focal length of the lens required to cure it will become:

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Q. If the distance of the far point for a myopia pa dent is doubled, the focal length of the lens required to cure it will become:

JIPMERJIPMER 2002

Solution:

In the eye defect of myopia, the focal length of lens $ f=-d, $ here d is the distance of far point. Therefore, if $ d $ is doubled the focal length will also be doubled.