A thin converging lens with focal length f = 25 cm projects the image of an object

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A thin converging lens with focal length f = 25 cm projects the image of an object on a screen removed from the lens by a distance l=5.0 m. Then the screen was drawn closer to the lens by a distance ∆l = 18 cm. By what distance should the object be shifted for its image to become sharp again?
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