Chapter/Index: Introduction | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Appendix
| A current through a set of windings can generate strong magnetic field. This field acts as a convex lens in electron microscopes, bringing off axis rays back to focus. The image is rotated to a degree that depends on the strength of the lens. Focal length can be altered by changing the strength of the current.
Figure 4950. Convex Electromagnetic Lens.
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