Question: A point source S of light is on the central axis of a thin positive lens. It is at a distance l 1 in front

A point source S of light is on the central axis of a thin positive lens. It is at a distance l1 in front of the lens, and a real image of S appears at P, a distance l2 from the lens. Is it possible to move the lens along the axis to a new location and not finally change the positions of S and P? If so, to where must the lens be relocated? Draw a diagram.

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