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First condenser lens
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C1 the first condenser lens, is shown highlighted in the diagram.

Its function is to:

  • Create a demagnified image of the gun crossover.
  • Control the minimum spot size obtainable in the rest of the condenser system.

If C1 has a focal length f, and the gun crossover is 10f from the lens, where is the demagnified image of the crossover and what is the demagnification?

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  Electron-atom interactions | Electron gun | Lenses

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