Abstract
This chapter draws attention towards electron mirrors and their uses. There is a practical difference between mirrors in which the incident beam is nearly normal to the ‘surface’ of the mirror while the surface is approximately plane, and mirrors in which the angle of incidence is large. In light optics, it is usual to treat these two situations together, but in particle optics, they require a different treatment because the optic axis in the first case is straight and the paraxial properties and aberrations are those of a system with a straight axis, often with rotational symmetry about this axis. Electron mirrors are encountered in the electron mirror microscope and in certain types of energy analyzer and filter lens, and have been proposed as elements of combined mirror-lens devices free of primary spherical aberration.
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