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Re: Dr.T's assertion

  • From: T3D John Bercovitz <bercov@xxxxxxxxxxx>
  • Subject: Re: Dr.T's assertion
  • Date: Thu, 17 Oct 96 07:59:41 PDT
John Vala writes:

[description of SEM operation; all new to me]

> I can't see any element along the way
> that would act as a "lensing" element which we could apply to standard
> geometric optics. 

How about the electron gun?  Is the beam steered from essentially a 
point source?  If it is, isn't that the moral equivalent of a lens with
focal length the distance of the "point source" to the sample?

John


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