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Question

# A magnifying glass has f=12 cm Where shall an object be placed to produce maximum angular magnification? Least distance of clear vision = 25 cm

A
7.1 cm
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B
6.8 cm
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C
8.4 cm
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D
8.1 cm
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Solution

## The correct option is D 8.1 cmGiven least distance of clear vision =25cm.Therefore, image is formed at a distance of 25cm from lens.The lens makers formula is 1v+1u=1f where u=distance of object from lens.v= distance of image from lensf= focal length of lens.Since magnifying lens is convex focal length is positive.Given conditions are v=−25 and f=+12,Substituting in the above equation we get u=8.1cm from the lens on the same side of image.

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