If tobacco Mosaic is so small that it can only be seen with an electron microscope, then how can cells of the Tobacco Mosaic be seen?

Answer choices:
- refraction of light
 - an area swollen with pus
 - by indirect light
 - death and devastation
 - bending light rays
 - electron microscope
 - deadly and devastating
 - Veins and arteries.

 

      electron microscope    