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Standard X

Physics

Lens Formula

A converging ...

Question

A converging lens of focal length 10 cm produces a twofold magnified real image of an object placed perpendicular to the principal axis. Find the distance of the object from the lens.

0.005 cm

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15 cm

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1.5 cm

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0.5 cm

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Solution

The correct option is B
15 cm

Magnification, $m = \frac{v}{u} = 2$
V =2u
$\Rightarrow \frac{1}{v} + \frac{1}{u} = \frac{1}{f}$
$\Rightarrow \frac{1}{2 u} + \frac{1}{u} = \frac{1}{10}$
2u = 30
u = 15.

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What is the magnification of the object? [4 MARKS]

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A converging lens of focal length 10 cm produces a twofold magnified real image of an object placed perpendicular to the principal axis. Find the distance of the object from the lens.

The correct option is B 15 cmMagnification, m=vu=2 V =2u ⇒1v+1u=1f ⇒12u+1u=110 2u = 30 u = 15.

The correct option is B
15 cm

Magnification, $m = \frac{v}{u} = 2$
V =2u
$\Rightarrow \frac{1}{v} + \frac{1}{u} = \frac{1}{f}$
$\Rightarrow \frac{1}{2 u} + \frac{1}{u} = \frac{1}{10}$
2u = 30
u = 15.