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Two converging lenses with the focal lengths f 1 = 0.2 m and f2 = 0.4...

Two converging lenses with the focal lengths f 1 = 0.2 m and f2 = 0.4 m are positioned at a distance f1 + f2 to each other. Such arrangements are called "beam expanders" and are often used in laser technology
a) What is the expansion ratio W2 / W1?

One of the two converging lenses is now to be replaced by a diverging lens, with the same expansion ratio W2 / W1 to be achieved.
b) Which of the two lenses is that and what is the focal length of the dissipation lens?
c) What is the distance of the lenses now?

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