Douglas W. O. Heddle, M. V. Kurepa
Abstract
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The focal loci of a number of three-element lenses have been measured and compared with calculations made using the design procedure of Heddle. Very good agreement is found provided that only paraxial rays are used.
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The focal loci of a number of three-element lenses have been measured and compared with calculations made using the design procedure of Heddle. Very good agreement is found provided that only paraxial rays are used.
Key concepts: Paraxial approximation, Electrostatic lens, Focal length, Electron, Element (criminal law), Optics, Physics, Electron optics