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rotationally symmetric lens

rotationally symmetric lens

A lens whose symmetry does not change even when rotated with respect to the lens axis. Conventionally-used lenses (objective lens, condenser lens, etc.) are "rotationally symmetric lenses." On the other hand, recently-developed lenses for analytical purposes, such as the Wien filter, the omega filter, the alfa filter and the Cs corrector, are non-rotationally symmetric lenses.

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