Microscope is a complex combined optical system, which has high visual magnification and can observe small objects in close range. A microscope consists of an objective lens and an eyepiece. After the object is magnified and imaged by the objective lens, its image is magnified by the eyepiece for human observation. According to the number of eyepieces, microscope can be divided into monocular microscope, binocular microscope and trinocular microscope; According to the application, it can be divided into biological microscope, metalloscope, stereo microscope, etc. Microscope is widely used in educational and scientific research, biomedical, industrial inspection, semiconductor inspection and other related fields.