How to correctly install and debug the microscope
Before using the microscope, first install the eyepiece and objective lens of the microscope. The installation of the eyepiece is relatively simple, but the main problem lies in the installation of the objective lens. Since the objective lens is more expensive, if the screw is not closed properly when the student installs it, it is easy to drop it on the ground and cause damage to the lens. Hold the objective lens with the index finger and middle finger of your left hand, and then install the objective lens with your right hand, so that even if it is not installed properly, it will not fall to the ground.
After the installation, it is important to align to the light. Aligning to the light is a very important step when using a microscope. When aligning to the light, some students randomly turn an objective lens to face the light hole instead of using a low-power lens to align to the light as required. I like to use one hand when turning the mirror, and it often turns the mirror down. Therefore, when teachers instruct students, they must emphasize the use of low-power mirrors to face the light. When the light is strong, use small apertures and flat mirrors, and when the light is weak, use large apertures and concave mirrors. Until a uniformly bright circular field of view. After the light is aligned, do not move the microscope casually, so as to prevent the light from entering the light hole accurately through the mirror.
Use the quasi-focus screw to adjust the focal length. The focal length must be lowered at a low magnification. First turn the coarse quasi-focus screw to lower the lens barrel slowly. The objective lens is close to the slide, but be careful not to let the objective touch the slide. During this process The middle eye should look at the objective lens from the side, and then look into the eyepiece with the left eye, and slowly adjust the coarse focus screw in reverse, so that the lens barrel rises slowly until the object image is seen, and at the same time explain to the students the object distance of a general microscope It is about 1 cm, so if the object distance is far more than 1 cm, but the object image is still not seen, it may be that the specimen is not in the field of view or the speed of turning the coarse and accurate focus helix is too fast. At this time, adjust the loading position, and then Repeat the above steps again
