MATTER Undergraduate web site

  MATTERTEM | Site Map | Help | Contact us | Glossary | About  

Previous ] Continue ]


Objective aperture
    G: 11 of 14

The objective aperture is placed in the back focal plane of the image.

Its function is to

  • Select those electrons which will contribute to the image, and thereby affect the appearance of the image
  • Improve the contrast of the final image.

Bearing in mind the question on the previous page can you suggest a possible alternative place to locate the "objective" aperture?

Previous ] Continue ]
  Electron-atom interactions | Electron gun | Lenses

2000 MATTER, The University of Liverpool. All rights reserved.
    contact us   Last updated: July 25, 2000 commercial information