Positive lens L1 gives at point S1 a real image of a point source S located on the optical axis of the lens. Another positive lens, L2, is placed between the source S and lens L1, the positions of the foci of which are specified (Fig. 138). Find by constructing a new position of the source image. Consider the case when the distance between S and L2 is less than the focal length of the lens L2.

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