Abstract
THE most famous optical medium furnishing a perfect optical image formation is the well-known ‘fish eye' of Maxwell1, the refractive index of which n(r) is given by the spherical distribution where A and a are constants. The trajectories are circles. Other media with ideal image formation have been found by W. Lenz2, and they are of the form The most obvious way of analogous construction of an ideal electron lens would be the realization of the corresponding potential by a spherical or axial symmetrical distribution of space charge3. This method is technically impossible, however, in the present state of development.
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