A double-convex lens is made of glass of refractive index 1.50.The radii of curvature of the surfaces are 10 cm and 20 cm.The focal length of this lens is
A)4.45 cm
B)13.3 cm
C)-13.3 cm
D)40 cm
E)-40 cm

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The Answer of A double-convex lens is made of glass of refractive index 1.50.The radii of curvature of the surfaces are 10 cm and 20 cm.The focal length of this lens is
A)4.45 cm
B)13.3 cm
C)-13.3 cm
D)40 cm
E)-40 cm

A Double-Convex Lens Is Made of Glass of Refractive Index