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The focal length of a thin lens made from the material of refractive index 1.5 is 15 cm. When it is placed in a liquid of refractive index 4/3 , its focal
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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