If in a planoconvex lens, the radius of curvature of the convex surface is \( 10 \mathrm{~cm} \)...
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If in a planoconvex lens, the radius of curvature of the convex surface is \( 10 \mathrm{~cm} \) and the focal length is \( 30 \mathrm{~cm} \), the refractive index of the material of the lens will be
(A) \( 1.5 \)
(B) \( 1.33 \)
(C) \( 1.66 \)
(D) 3
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