Answer :

Given data –


Focal length, f = 12 cm


Distance of clear vision, d = 25 cm


For maximum angular magnification,


Image distance = Least distance of clear vision



v = d = − 25 cm


Using len’s formula-




Substituting the values, we will get –



cms


Hence the object should be placed at a distance of 8.1 cm away from the lens for obtaining


maximum magnification.


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