Light microscopes work by passing light through a specimen and then magnifying the image of the specimen with a series of lenses. The objective lens, which is located at the bottom of the microscope, gathers light from the specimen and focuses it on the image plane. The eyepiece lens, which is located at the top of the microscope, then magnifies the image of the specimen.
The total magnification of a light microscope is determined by multiplying the magnification of the objective lens by the magnification of the eyepiece lens. For example, a microscope with a 10x objective lens and a 10x eyepiece lens would have a total magnification of 100x.
Light microscopes have a number of advantages over other types of microscopes. They are relatively inexpensive and easy to use, and they produce images that are easy to interpret. However, light microscopes are limited by the wavelength of visible light, which means that they cannot be used to magnify objects that are smaller than about 0.2 micrometers.
Electron microscopes and scanning probe microscopes are two other types of microscopes that can be used to magnify objects at a much smaller scale than light microscopes. Electron microscopes use a beam of electrons instead of visible light, while scanning probe microscopes use a sharp probe to scan the surface of a specimen. These types of microscopes can be used to magnify objects at a resolution of a few nanometers.
