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Short focal length - PowerPoint PPT Presentation

Electron Optics Two essential components:

Electron gun Cathode Anode Alignment coils. Lenses condensers objective. Objective aperture assembly. Electron Optics Two essential components:. Electron source (gun) Focusing system (lenses) Add scanning apparatus for imaging. sample. ? ? ?. F = -e(VxB).

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Lenses

Lenses. Are classified by their Focal Length. Focal Length. The distance from the optical center of a lens to the front surface of the imaging device. Short Focal Length. Wide Angle View. Short Focal Length. EXAMPLE Entire Football Team. Long Focal Length. Narrow Angle View.

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Lenses

Lenses. camera obscura / pinhole camera. 3. Focal length is the distance between the lens and the point where the light rays converge. It controls magnification and angle of view in a picture. 5. Focal length controls magnification and angle of view.

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Short focal length - PowerPoint PPT Presentation

Electron Optics Two essential components:

Lenses

Lenses