Radii of curvature of a convex lens are \( 20 \mathrm{~cm} \) and \...

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Radii of curvature of a convex lens are \( 20 \mathrm{~cm} \) and \( 30 \mathrm{~cm} \) and its focal length if 24 \( \mathrm{cm} \). Refractive index of the lens will be
P
(A) \( 1.33 \)
(B) \( 1.5 \)
W
(C) \( 1.71 \)
(D) None of these
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