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  4. A nearsighted man can clearly see object only upto a distance of 1 m and not beyond this. The power of the spectacles lens (in D) necessary for the remedy of this defect will be

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Q. A nearsighted man can clearly see object only upto a distance of $1\, m$ and not beyond this. The power of the spectacles lens (in D) necessary for the remedy of this defect will be

Solution:

For the remedy of nearsightedness spectracles with such a lens used which will brings object at $\infty$ to his farthest distance of clear vision.
image
$\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$
$\frac{1}{-1}-\frac{1}{\infty}=\frac{1}{f}=p$
$\Rightarrow p=-1\, D$