For a plano convex lens, the radius of curvature of convex surface is 10 cm and the focal length is 30 cm. The refractive index

For a plano convex lens, the radius of curvature of convex surface is 10 cm and the focal length is 30 cm. The refractive index of the material of the lens is
A. 1.5
B. 1.66
C. 1.33
D. 2.5

For a plano convex lens, the radius of curvature of convex surface is 10 cm and the focal length is 30 cm. The refractive index of the material of the

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