Two thin lenses of the same material and mounted coaxial are to have minimum spherical and chromatic aberration. Find the ratio of their focal lengths and the separation between them in terms their focal lengths.
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Two convex thin lenses with focal lengths 10.0 cm and 20.0 cm are aligned on a common axis, running left to right, the 10-cm lens being on the left. A distance of 20.0 cm separates the lenses. An object is located at a distance of 15.0 cm to the left of the 10-cm lens.
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