Focal length of a thin lens in air, is 10 cm. Now medium on one side of the lens is replaced by a medium of refractive index mu = 2. The radius
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Calculate the focal length of the thin lens shown in figure. The points C 1 and C 2 denote the centres of curvature. Refractive index of lens is 1.5.A. 20 cmB. 40 cmC. 80 cmD. 60 cm