There are numerous reflecting optical system designs that call for oblate spheroidal surfaces. Yet there is reluctance to build such systems out of concern over the means of testing such surfaces. This short paper outlines several simple null tests for aspheric surfaces that lack conjugate foci.
© 1984 Optical Society of America
Original Manuscript: December 5, 1983
Published: April 15, 1984
John M. Rodgers and Robert E. Parks, "Null tests for oblate spheroids," Appl. Opt. 23, 1246-1248 (1984)