Question: In the process of constructing a doublet, an equiconvex thin lens L 1 is positioned in intimate contact with a thin negative lens, L 2

In the process of constructing a doublet, an equiconvex thin lens L1 is positioned in intimate contact with a thin negative lens, L2, such that the combination has a focal length of 50 cm in air. If their indices are 1.50 and 1.55, respectively, and if the focal length of L2 is -50 cm, determine all the radii of curvature.

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