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[" 17.The radius of curvature of the fac...

[" 17.The radius of curvature of the faces of a double convex "],[" lens are "10cm" and "15cm" respectively.If focal length "],[" of the lens is "12cm" ,find the refractive index of the "],[" material of the lens."]

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The radii of curvature of the faces of a double convex lens are 10 cm and 12 cm respectively.If the focal length of the lens is 12 cm ,find the refractive index of the material of the lens.

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