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Question

If the focal length of a magnifying glass is 2.5 cm, it can magnify an object
  1. 15 times
  2. 11 times
  3. 2.5 times
  4. none of these

A
11 times
B
15 times
C
2.5 times
D
none of these
Solution
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Magnifying power MP=(0.25m)ϕ+1 where ϕ=1f=10.025=40D is optical power in dioptre.
MP=0.25×40+1=11times

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