(C) An electron microscope uses electromagnetic lenses to focus the beam of electrons. These lenses consist of a coil of wire enclosed in a soft iron

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(C) An electron microscope uses electromagnetic lenses to focus the beam of electrons. These lenses consist of a coil of wire enclosed in a soft iron casing,which generates a magnetic field to deflect and focus the electron beam,similar to how glass lenses focus light in a light microscope.