First slide

The lens

Question

In order to obtain a real image of magnification 2 using a converging lens of focal length 20 cm, where should an object be placed

Moderate

A

50 cm
B

30 cm
C

-50 cm
D

-30 cm

Solution

$For real image m = - 2 ∴ m = \frac{f}{u + f} \Rightarrow - 2 = \frac{f}{u + f} = \frac{20}{u + 20} \Rightarrow u = - 30 cm$

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