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A thin converging lens with focal length...

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 draws closer to the lens by a distance `Delta l = 18 cm`. By what distance should the object be shifted for its image to become sharp again ?

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PHYSICS GALAXY - ASHISH ARORA-GEOMETRICAL OPTICS-Unsolved Numerical Problems
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