A plano-convex lens is made of a material of refractive index u = 1.5. The radius of curvature of curved surface of the lens is 20 cm. If its plane surface is silvered, the focal length of the slivered lens will be

10 cm

20 cm

40 cm

80 cm

A

40 cm

B

80 cm

C

20 cm

D

10 cm

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