Vol. 10, Issue 3, pp. 199-204 (1980)

Abstract

In the paper the formulae for the third order aberrations of a narrow oblique collimated beam focused by a geodesic lens composed of two conical surfaces have been introduced. The measures of asymmetry of the beam with respect to the central ray as the function of the slope and the aperture of the beams have been proposed. The position of the stigmatic image for the lens R-2R has been examined.