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Supernumerary spacing of rainbows produced by an elliptical-cross-section cylinder. II. Experiment

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Abstract

We measured the supernumerary spacing parameter of the first- and second-order rainbows of two glass rods, each having an approximately elliptical cross section, as a function of the rod’s rotation angle. We attribute large fluctuations in the supernumerary spacing parameter to small local inhomogeneities in the rod’s refractive index. The low-pass filtered first-order rainbow experimental data agree with the prediction of ray-tracing–wave-front modeling to within a few percent, and the second-order rainbow data exhibit additional effects that are due to rod nonellipticity.

© 2001 Optical Society of America

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