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. (C) 2001 Optical Society of America.
Supernumerary Spacing of Rainbows Produced by an Elliptical-Cross-Section Cylinder. II. ExperimentApplied Optics
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Citation InformationAdler, Charles L., David Phipps, Kirk W. Saunders, Justin K. Nash, and James A. Lock. "Supernumerary Spacing of Rainbows Produced by an Elliptical-Cross-Section Cylinder. II. Experiment." Applied Optics 40 (2001): 2535-2545.