The longer the focal length of the eyepiece, the higher the magnification; The shorter the focal length of the objective lens, the higher the magnification.
General eyepiece magnification is 8X, 10X, 15X, and 20X. These multiples are compared with the shortest apparent distance of normal people, D250mm, so the focal length of the eyepiece can be calculated by dividing 250mm by the magnification. Although the accepted standard distance is 250mm, the current microscope will be designed with a focal length of only 160mm, which makes the instrument very compact.
The magnification of the objective lens refers to the ability of the objective lens to magnify the multiple of the object on the line length. There are two representations, one is to directly scale out such as 8×, 10×, 45× on the objective lens; The other is to scale the focal length of the objective lens. The shorter the focal length, the higher the magnification.
Precautions for using microscope:
1. When holding the mirror, you must hold the arm with your right hand and the bracket with your left hand. You cannot extract it with one hand to avoid parts falling off or colliding with other places.
2, handle with care, don't put the microscope on the edge of the experimental platform, should be placed 10cm away from the edge, so as not to knock over the ground.
3. Keep the microscope clean. The optical and lighting parts can only be wiped with mirror paper, and it is forbidden to touch by hand or wipe with cloth, and the mechanical parts can be wiped with cloth.
4. Do not touch the lens and the stage with water drops, alcohol or other drugs. If it is stained, wipe it with mirror paper immediately.
5. When placing the slide specimen, aim at the center of the light hole, and do not put the slide backwards to prevent crushing the slide or damaging the objective lens.
6, to develop the habit of two eyes open observation at the same time, with the left eye to observe the field of vision, the right eye for drawing.
7. Don't take off the eyepiece at will to prevent dust from falling into the objective lens, and don't disassemble various parts at will to prevent damage.
