1. Mirror base: It is the base of the microscope to support the whole mirror body.

2. Mirror arm: the part to hold when taking and placing the microscope.

3. Lens barrel: connected to the upper front of the lens arm, the upper end of the lens barrel is equipped with an eyepiece, and the lower end is equipped with an objective lens converter.

4. Stage: Under the lens barrel, there are two shapes, square and round, for placing slide samples. There is a light hole in the center, and there are clamps on both sides to fix slide samples.

5. Shutter: There are round holes of different sizes on it, which are called apertures. Adjustable light intensity.

6. Coarse quasi-focus spiral: It can make the mirror stage move up and down quickly and greatly, and can quickly adjust the distance between the objective lens and the specimen to make the object image appear in the field of vision. Usually, when using a low-magnification lens, first use the coarse adjuster to quickly find the object image.

7. Fine focus helix: It can make the mirror stage rise and fall slowly, and it is mostly used when using a high-power mirror, so as to obtain a clearer image.

8. Reflective mirror: It is installed on the mirror base and can be rotated in any direction. It has two sides, flat and concave. The concave mirror has a strong light-gathering effect and is suitable for use when the light is weak.

9. Eyepiece: Magnify the object image. The longer the eyepiece, the lower the magnification.

10. Objective lens: to enlarge the object image. The longer the objective lens, the greater the magnification.

1. Calculation of microscope object image magnification
The magnification of the object image=the magnification of the eyepiece × the magnification of the objective lens.

2. Changes in the number of cells in the field of view
(1) The change of the number of cells in a row can be calculated according to the law that the magnification is inversely proportional to the field of view.

(2) The change of the number of cells in the circular field of view can be calculated according to the rule that the seen physical range is inversely proportional to the square of the magnification.