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
Original Manuscript: June 23, 1997
Revised Manuscript: September 29, 1997
Published: March 20, 1998
Dean S. Langley and Philip L. Marston, "Generalized tertiary rainbow of slightly oblate drops: observations with laser illumination," Appl. Opt. 37, 1520-1526 (1998)