1,Simple microscope
Simple microscope is composed of one or a group of positive lens (plano-convex or biconvex lens). This kind of microscope focal length is short, observation, the eye to be very close to the lens, the lens must also be very close to the object. Simple microscope produced by the object image is easily misshapen and distorted, so the magnifying power of 20 times or less, the general use of the magnifying glass that is a kind of microscope.

2, compound microscope
Compound microscope is composed of two or two groups of lenses and compound microscope mechanical body, is generally used in the laboratory for people to observe biological specimens used in the instrument, but also our impression of the microscope. This microscope two groups of lenses, a group is close to the observation of the specimen of the lens known as the objective lens or referred to as the objective lens, the other group is close to the eye, with the observation of the lens, known as the eyepiece or referred to as the eyepiece. Compound microscope due to the function and use of different purposes, can be divided into three-dimensional (anatomical) microscope and general optical microscope.

a, three-dimensional (anatomical) microscope
Stereo microscope is mainly used to observe opaque objects or biological specimens of the external form, or used in industrial lines and some biomedical technology. This kind of microscope because of the light source, depth of field and other imaging factors, magnification below 60 times, better resolution.