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LENSES

 
Condenser aperture
    G: 8 of 14
 

The condenser aperture controls the fraction of the beam which is allowed to hit the specimen. It therefore helps to control the intensity of illumination, and in the SEM, the depth of field.

You can see the effect of this in the simulation on the next page.

If a condenser aperture is replaced by another of half the diameter, by how much is the beam current reduced?

 
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