A double convex lens of focal length 6 cm is made of glass of refractive index 1.5. The radius of curvature of one surface is double that of other surface. The value of small radius of curvature is
(a) 6 cm
(b) 4.5 cm
(c) 9 cm
(d) 4 cm
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The value of small radius of curvature is
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