# The power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10 cm.

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The power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10 cm. Then the refractive index of the material of the lens is :

(1) $3\over2$

(2) $4\over3$

(3) $9\over8$

(4) $5\over3$