Optics Question 681

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

[AFMC 2004]

Options:

A) 50 cm

B) 30 cm

C) - 50 cm

D) - 30 cm

Show Answer

Answer:

Correct Answer: D

Solution:

For real image $ m=-2 $

$ \therefore m=\frac{f}{u+f} $

$ \Rightarrow -2=\frac{f}{u+f}=\frac{20}{u+20} $

Therefore u = - 30 cm.



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