Electron microscope

The basic idea employed in the design of electron microscope is the wave nature of the particle. Here a beam of electrons is used. Focusing of these electrons is carried out by electric and magnetic fields. The wavelength of electrons is very much shorter than the wavelength of visible light. Since the resolving power of a microscope is directly to the wavelength of light used, electron microscope has higher resolving power compared to an optical microscope. Electrostatic lens and magnetic lens are used in electron microscopes. A source emits electron beam which is accelerated by a high potential. The accelerated beam is focused by a magnetic lens which forms a magnified image. The projection lens forms a real magnified image on a fluorescent screen.  Electron microscopes are widely used in medical field, crystallography and in surface studies