1.

Where should an object be placed from a converging lens of focal length 20 cm, so as to obtain a real magnified image.

Answer»

SOLUTION :`f=20cm, U=?, m=2`
`m=c/uimplies2=v/uimpliesv=2U`
`1/f=1/v-1/u`
`implies1/20=1/(2u)-1/u`
`impliesu=-10cm`
`v=-20cm`


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