Viruses are so small that they can be seen only with an electron microscope, and on the surface of each microscopic color filter is also a microscopic lens. Given these facts, viruses are so small that to see them a scientist would have to use what kind of lens among the following options:
- Refract it
 - refraction of light
 - an electron lens
 - an image
 - rays or beams
 - bending light rays
 - A computer
 - flashlights


 

   an electron lens      