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The focal length of an equiconvex lens is equal to the radius of curvature of either face. What is the refractive index of the material of the lens?

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The focal length of an equiconvex lens is equal to the radius of curvature of either face. What is the refractive index of the material of the lens?

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Here, 

f = R1 = R2 = R (say) 

From lens maker’s formula,

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