title: Null testing convex optical surfaces.
abstract: A new test for convex optical surfaces is presented. It makes use of an auxiliary ellipsoidal mirror that is of approximately the same diameter as the convex mirror tested. The test is a null test of excellent precision. The auxiliary ellipsoid used is also tested in a null fashion, permitting good precision to be obtained.
authors.forename: A
authors.initials: A
authors.lastname: Szulc