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Chemistry, 04.03.2021 16:50 hjeffrey168

A luminous object and a screen are placed on an optimal bench and a converging lens is place between them to throw a sharp image of the object on the screen. The linear magnification or
image is found to be 2.5. The lens is now moved 30 cm. nearer the screen and a sharp image again
formed. Calculate the focal length of the lens.

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