An object and a screen are mounted on the optical bench and a converging lens is placed between them so that a sharp image is obtained on the screen.The linear magnification of the image is 25.The lens is now moved 30cm towards the screen and a sharp image is again formed on the screen.the focal length of the lens isa.14.0 cmb.14.3 cmc.14.6 cmd.14.9 cm

Dear Menka,

The focal length of the lens is 14.3 cm.

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