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When an object is at a distance 3 meters and 1meters from the optical centre of a convex lens, a real and virtual image are formed respectively, with the same magnification. Find the focal length of the lens (in meters)

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Correct Answer - 2
`[2]`
`f/(-u_(1)+f)=-f/((-u_(2)+f))implies-u_(2)+f=u_(1)-fimpliesf=(u_(1)+u_(2))/2=2`

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