A concave-convex lens of flint glass has radii of 12 cm and 10 cm,respectively,and an index of refraction of 1.60.The focal length of this lens is
A)100 cm
B)-100 cm
C)9.1 cm
D)-9.1 cm
E)14.5 cm

Question

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The Answer of A concave-convex lens of flint glass has radii of 12 cm and 10 cm,respectively,and an index of refraction of 1.60.The focal length of this lens is
A)100 cm
B)-100 cm
C)9.1 cm
D)-9.1 cm
E)14.5 cm

A Concave-Convex Lens of Flint Glass Has Radii of 12