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12 Wil 12 A plano-convex lens (focal length f, refractive index us. radius of curvature R) fits exactly into a plano-concave lens (focal length fı, refractive index Hj, radius of curvature R). Their plane surfaces are parallel to each other. Then, the focal length of the combination will be: (1) f1-f2 42-M1 2f1f2 (3) fi+f2 (4) f1 + f2

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