Q.

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

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a

50 cm

b

30 cm

c

-50 cm

d

-30 cm

answer is D.

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Detailed Solution

For real image m=−2 ∴m=fu+f⇒−2=fu+f=20u+20⇒u=−30cm
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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