Microscope is basically an instrument which is being used to see the objects that are really small for the naked eye. The instrument being used by the science of investigating small objects is known as microscopy. Microscopic means unseen to the eyeball unless assisted by the microscope. There are several types of microscopes, the most common is the optical microscope, and it was the first to be invented. It uses light to image sample. Other chief categories of microscopes are the electron microscope along with the other types of scanning probe microscope.