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  4. The maximum magnification that can be obtained with a convex lens of focal length 2.5 cm is (the least distance of distinct vision is 25 cm ).

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Q. The maximum magnification that can be obtained with a convex lens of focal length $2.5 cm$ is (the least distance of distinct vision is $25 cm$ ).

Ray Optics and Optical Instruments

Solution:

max. magnification
$=1+\frac{D}{f}$ $m =1+\frac{25}{2.5}$
$m=1+10=11$
$m=11$