The angular location of the recently discovered cusp pattern in the far-field scattering from an oblate spheroid is calculated as a function of the aspect ratio D/H. The calculation assumes the diameter D ≫ λ and is limited to illumination perpendicular to the short axis of the spheroid. It agrees with observations for water drops in the range 1.22 < D/H < 1.37 with D ~ 1 mm.
© 1985 Optical Society of America
Original Manuscript: June 11, 1985
Manuscript Accepted: September 18, 1985
Published: December 1, 1985
Philip L. Marston, "Cusp diffraction catastrophe from spheroids: generalized rainbows and inverse scattering," Opt. Lett. 10, 588-590 (1985)