The magnification of each objective can be identified by its appearance. The longer the lens length, the smaller the lens diameter, and the greater the magnification; On the contrary, the magnification is small. The length of the oil lens is greater than that of low and high magnification lenses, and the lower edge of the lens is generally engraved with a circle of black or white lines, and is also engraved with 100 ×, Words such as 1.25 or oil.
1. When using a microscope oil mirror, the microscope must be upright on the table, and the mirror arm must not be bent to tilt the stage, in order to avoid the overflow of tar, affecting observation, and polluting the table.
2. Aiming:
When observing the object with a low-power or high-power microscope or examining an unstained specimen with an oil microscope, it is necessary to lower the light collector and appropriately reduce the aperture to weaken the luminosity; When using an oil microscope to examine stained specimens, the luminosity should be strong. The brightness switch of the microscope should be turned to * bright, the aperture should be fully opened, and the light collector should rise to level with the stage.
3. Zoom length:
A. Place the specimen slide on the stage, fix it with a specimen pusher, and move the part to be examined under the objective lens. First, use a low-power microscope to locate the position of the specimen, then raise the lens tube, apply one drop of lens oil to the area to be tested, and then change the oil lens for observation.
The lens of the oil lens is very small. When light passes through the air between the glass slide and the oil lens, refraction or total reflection occurs due to different media densities, reducing the amount of light entering the lens and blurring the image. If cedar oil (n=1.515) with a refractive index similar to that of the glass (n=1.52) is added between the oil mirror and the glass slide, it will increase the amount of light entering the lens, enhance the brightness of the field of view, and make the object image bright and clear.
