Abstract
Spherical and chromatic aberration are inherent in electron lenses. Under certain conditions the possibility exists that these lens aberrations can be eliminated or compensated. The conditions under which such corrections are possible (in principle) have been characterized originally by Scherzer and later by Septier. One type of correcting system involves the use of an electrostatic electron mirror. The work presented here deals with the properties of hyperbolic electron mirrors and the conditions for matching the correcting properties of a mirror to the spherical and chromatic aberration of a lens or lens system.In an earlier work by the authors, the properties of the hyperbolic mirror were studied for rays incident on the mirror parallel to the optical axis. In the present work, symmetrical rays are studied.
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