Positive lens L1 gives at point S1 a real image of a point source 5 located on the optical axis of the lens. Between L1 and S1 there is a negative lens L2, the positions of the foci of which are specified (Fig. 136). Find by constructing a new position of the source image. Consider the case when the distance between S1 and L2 is greater than the focal length of the lens L2.

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