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  4. A magnifying glass of focal length 5 cm is used to view an object by a person whose smallest distance of distinct vision is 25 cm . If he holds the glass close to eye, the magnification is

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Q. A magnifying glass of focal length $ 5\,cm $ is used to view an object by a person whose smallest distance of distinct vision is $ 25\,cm $ . If he holds the glass close to eye, the magnification is

J & K CETJ & K CET 2013Ray Optics and Optical Instruments

Solution:

$m=1+\frac{D}{f}$
Given, $f=5\, cm,\, D=25\, cm$
$\therefore m=1+\frac{25}{5}=6$