The power of a biconvex lens is 10 diopt...

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,

`frac(3)(2)`

`frac(4)(3)`

`frac(9)(8)`

`frac(5)(3)`

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