Abstract

Computation of large-aperture mirror systems by conventional methods tends to yield solutions which are no more than approximately exact. This paper develops and demonstrates a new procedure involving a finite difference equation. The method offers several advantages, such as a direct analytical approach to and exact solutions of problems of spherical aberration and coma. A numerical example is given. Although the two-mirror case is demonstrated, the method is equally applicable to three mirrors as will, it is hoped, be demonstrated by another article to follow.

© 1952 Optical Society of America

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