If the effective area of the raster of an electron microscope specimen, supplying information to the CRT of an electron microscope, has a 5nm diameter and the semicone angle, a, of the electron beam is 0.01 rad.:
(a) What would be the maximum usable magnification of the microscope if a digital spot on thescreen of the CRT has a 100 µm diameter?
(b) What would be the depth of field at this magnification?
(c) What would be the depth of field if this microscope were to be operated at a magnificationof 2000X?
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