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Question

If the focal length of a magnifying glass is 2.5 cm, it can magnify an object

A

15 times

B

11 times

C

2.5 times

D

none of these

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Solution

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Correct option is B)

Magnifying power MP $= (0.25 m) ϕ + 1$ where $ϕ = \frac{1}{f} = \frac{1}{0 . 0 2 5} = 40 D$ is optical power in dioptre.
$M P = 0.25 \times 40 + 1 = 11 t i m e s$

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