how do you shoot lasers down microscopes to see biological molecules and what are monecules ?

Question: how do you shoot lasers down microscopes to see biological molecules and what are monecules ?
- Keywords:
  lasers,
  microscope,
  molecules
Asked by rosieroo223 to Mark on 10 Mar 2014.
- Mark Wallace answered on 10 Mar 2014:
  
  A laser is a beam of light (look at my profile pics). A microscope is an instrument that let’s you look at small stuff. I use mirrors to bounce the light from the laser into the microscope to light up my experiments.
  
  Molecules are the smallest building blocks from which all things are made of. A individual molecule is about 10,000,000 times smaller than this full stop.

Question: how do you shoot lasers down microscopes to see biological molecules and what are monecules ?