A device for focusing a stream of electrons by means of electric or magnetic fields.
- An electron lens is used for focusing electrons from a cathode to an anode.
- Ruska knew that electrons could be manipulated within a magnetic field, and in the late 1920s, he designed a magnetic coil that acted as an electron lens.
- The technology, called aberration correction, fixes imperfections on the microscope's electron lenses.
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