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Practice: Electron Diffraction and Microscopy

A rectangular section of a cylindrical electrostatic lens in an electron microscope is shown in the diagram. The electric potential increases along the length of the lens; the potential 𝑉 is greater than the potential 𝑉. An electron that is equidistant from the sides of the lens moves parallel to the axis of the lens. Which of the paths I, II, and III shown does the electron move along?

  • AII
  • BI
  • CIII
  • DNone of these paths

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