An electron microscope is used for seeing very small objects by making them appear bigger, and electron microscopes use a beam of electrons as their source of illumination. Given these facts, to make very small objects appear bigger, one can use what instead of light for illumination among the following options:
- electricity
 - electron beam
 - by indirect light
 - reflecting light
 - photons
 - Electrical energy
 - heat energy
 - mirrors


 

  electron beam       