Question: A bright object is placed on one side of a converging lens of focal length f, and a white screen for viewing the image is

A bright object is placed on one side of a converging lens of focal length f, and a white screen for viewing the image is on the opposite side. The distance dT = di + do between the object and the screen is kept fixed, but the lens can be moved.
(a) Show that if dT> 4f, there will be two positions where the lens can be placed and a sharp image is formed.
(c) Determine a formula for the distance between the two lens positions in part (a), and the ratio of the image sizes.

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