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Deflection of electrons (ii)
    G1: 2 of 2

An electron which is already travelling at high velocity through the lens (approximately in the direction of the magnetic field lines) will experience the same force pushing it into a circular path, which will cause it to follow a helical path

An electron moving almost parallel to the magnetic field in a magnetic lens will thus take a helical path. This condition applies to an electron travelling just off the optical axis of the lens. This is animated by clicking on the start button opposite.

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  Electron-atom interactions | Electron gun | Lenses

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