When an object is at a distance u_1 and u_2 from a lens, real image and a virtual image is formed...

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When an object is at a distance u_1 and u_2 from a lens, real image and a virtual image is formed respectively having same magnification. The focal length of the lens is
(1) u_1-u_2
(2) u_1-u_2/2
(3) u_1+u_2/2
(4) u_1+u_2

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