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Published in:
2009 | OriginalPaper | Chapter
Lenses, Apertures, and Resolution
Authors : David B. Williams, C. Barry Carter
Published in: Transmission Electron Microscopy
Publisher: Springer US
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Electron lenses are the TEM’s equivalent of the glass lenses in a visible light microscope (VLM) and, to a large extent, we can draw comparisons between the two. For example, the behavior of all the lenses in a standard TEM can be approximated to the action of a convex (converging) glass lens on monochromatic light. The lens is basically used to do two things ■ Take all the rays emanating from a point in an object and recreate a point in an image ■ Focus parallel rays to a point in the focal plane of the lens