1970/01/01 by Erich W. Marchand
Earth and Planetary Sciences · Computer Science · #3D Surveying and Cultural Heritage #Optical measurement and interference techniques #Computer Graphics and Visualization Techniques
paper · doi:10.1364/josa.60.000001
A gradient-index element is one in which the refractive index varies appreciably in a layer just below the surface of the glass. The present paper deals with practical methods of tracing rays through such a medium. One method, due to L. Montagnino, lends itself to rapid computer ray tracing. A second method, through restricted to the case of spherical symmetry in the index function, lends itself both to computer tracing and to analytical investigations.