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  4. What powered lens should be used for the correction of a myopic eye whose far point is 85 cm?

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Q. What powered lens should be used for the correction of a myopic eye whose far point is $85 \,cm$?

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Solution:

Distance of far point $x=85 \,cm$
As $f=-x=-50\, cm =-0.85\, m$
$P=-\frac{1}{0.85}=-1.17$