Where should an object be placed from a converging lens of focal length 20cm,
so as to obtain a real magnified imagel
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The magnification of the image in a converging lens is 2.
⇒−vu=2⇒v=−2u.
The lens formula for a converging lens is 1v−1u=1f.
⇒−12u−1u=120⇒−32u=120
⇒u=−32×20=−30 cm.
⇒ The object should be placed at a distance of 30 cm from the mirror.
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