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  4. A person near point of vision is 100 cm. Then, the power of lens he must wear so as to have normal vision is

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Q. A person near point of vision is $100\, cm$. Then, the power of lens he must wear so as to have normal vision is

ManipalManipal 2015

Solution:

$f =\frac{ yD }{ y - D }=\frac{100 \times 25}{100-25}$
$=\frac{100}{3} cm =\frac{1}{3} m$
$P =\frac{1}{ f }=+3\, D$