The meaning of microscope magnification
The magnification of the microscope is the product of the magnification of the objective lens and the magnification of the eyepiece. For example, if the objective lens is 10× and the eyepiece is 10×, the magnification is 10×10=100. The length of the microscope eyepiece is negatively correlated with the magnification, and the length of the objective lens is positively correlated with the magnification. That is, the longer the eyepiece length, the lower the magnification; the longer the objective lens, the higher the magnification.
An electron microscope is an instrument that uses electron beams and electron lenses instead of light beams and optical lenses to image the fine structures of substances at very high magnifications based on the principle of electron optics.
Microscopes generally have three objective lenses, namely low magnification, high magnification and oil lens, which are fixed in the hole of the objective lens conversion plate. When observing specimens, first use a low-magnification objective lens. At this time, the field of view is larger, and the specimens are easier to detect, but the magnification is small (generally 100 times), and the structure of smaller objects is difficult to observe. The high-magnification objective lens has a large magnification (generally magnification 400 times), and can observe tiny objects or structures.
