An object is at a distance d to the left of a flat screen. A converging lens

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An object is at a distance d to the left of a flat screen. A converging lens with focal length f < d/4 is placed between object and screen.
(a) Show that two lens positions exist that form an image on the screen, and determine how far these positions are from the object.
(b) How do the two images differ from each other?
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