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

15 times

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11 times

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2.5 times

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none of these

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Solution

The correct option is B 11 times
Magnifying power MP $= (0.25 m) ϕ + 1$ where $ϕ = \frac{1}{f} = \frac{1}{0.025} = 40 D$ is optical power in dioptre.
$M P = 0.25 \times 40 + 1 = 11 t i m e s$

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

The correct option is B 11 timesMagnifying power MP=(0.25m)ϕ+1 where ϕ=1f=10.025=40D is optical power in dioptre.MP=0.25×40+1=11times

The correct option is B 11 times
Magnifying power MP $= (0.25 m) ϕ + 1$ where $ϕ = \frac{1}{f} = \frac{1}{0.025} = 40 D$ is optical power in dioptre.
$M P = 0.25 \times 40 + 1 = 11 t i m e s$