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Optical Measurement of a Refractive Index for Large Sphere via Scattering

A simple method is demonstrated to determine the index of refraction of dielectric spheres by observing the scattering of visible light. Theoretical calculations show that there is an approximately linear relationship exists between the size parameter x=ka=2πn1a/λ of the scattering sphere and the number of maxima and minima in the scattered field as a function of angle when the size parameter in the 6000–12000-region.