10 1 find the focal length f of a biconvex lens with n 1 5 r1 20 cm an
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10. (1) Find the focal length (f) of a biconvex lens with n = 1.5, R1 = 20 cm, and R2 = - 20 cm. (2) Find the focal length (f) of a convex-concave lens with n = 1.5, R1 = 10 cm, and R2 = 20 cm.