Question: An aligned optical system consists of two thin lenses with focal lengths f1 and f2, the distance between the lenses being equal to d. The

An aligned optical system consists of two thin lenses with focal lengths f1 and f2, the distance between the lenses being equal to d. The given system has to be replaced by one thin lens which, at any position of an object, would provide the same transverse magnification as the system. What must the focal length of this lens be equal to and in what position must it be placed with respect to the two-lens system?

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