Why must scientists cut a thin slice from a biological specimen before they can do it under a microscope

Time for microscopes 101. There are two major types of microscopes; light and electron. In a light microscope the image if seen by refracting light through 2 or more lenses which result in a magnified image of the specimen being viewed. However there are limits to the ability to view these and they are not powerful enough to view very small object. An electron microscope which was referred to in the question works by cutting the specimen to be viewed into a very small piece and then bombarding it with electrons which result in a much clearer and more magnified viewing. HOWEVER, Electron microscopes do not work on living things while regular light microscopes do. Also, due to way how electron microscopes are made they are not common in everyday laboratories and are very expensive to buy.  comment below if you need anything else