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TEM Basics

 
Lenses
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Lenses

Electron lenses are the magnetic equivalent of the glass lenses in an optical microscope and to a large extent, we can draw comparisons between the two. For example the behaviour of all the lenses in a 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

  • either take all the rays emanating from a point in an object and recreate a point in an image,
  • or focus parallel rays to a point in the focal plane of the lens.

In a TEM can we expect to have 'monochromatic' radiation passing through every lens?

 

 
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