The focal length of the Plano convex lens is 2R where R is the radius of curvature of the surface ,then the refractive index of the material of lens is ????
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The focal length of the plane convex lens is 2R where R is the radius of cu. The focal length of the plane convex lens is 2R where R is the radius of curvature of the surface then the refractive index of the material of the lens is.
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