A radial gradient rod is shown to be paraxially equivalent to three air-spaced thin lenses. Formulas for calculating the powers and spacings are given, and some ray traces are compared. The effective aperture stop and entrance pupil are derived.
© 1984 Optical Society of America
Michael E. Harrigan, "Some first-order properties of radial gradient lenses compared to homogeneous lenses," Appl. Opt. 23, 2702-2705 (1984)