The tertiary rainbow of acoustically levitated water drops was
observed in the laboratory. Nontrivial caustics were observed for
relatively small values of eccentricity. The angular locations of
caustics were modeled with matrix methods of generalized ray
tracing. Photographs of the scattering were in general agreement
with models. Possible effects on the appearance of natural tertiary
bow features are discussed.
© 1998 Optical Society of America
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