Why do you need to wipe the cedar oil on the oil lens when using the oil lens of the microscope?
Because the refractive index of glass and cedar oil is similar, dripping cedar oil during microscope inspection can offset the refraction of light passing through the glass and avoid blurred images.
When using an oil lens, it is allowed not to add cedar oil between the condenser and the specimen, that is, air is still used as the medium on the condenser, but this will sacrifice the resolution of the objective lens.
If you need to switch back to the high-magnification objective lens for observation after using the oil lens, wipe off the oil on the cover glass to avoid contamination of the high-power objective lens. However, the oil on the concentrator does not need to be wiped, as long as the aperture is properly reduced a little.
After the oil lens is used, the cedar oil should be wiped clean in time. The lens can be wiped 1 or 2 times with a clean lens cleaning paper to wipe off most of the oil.
Then wipe it twice with a lens tissue wetted with xylene, and finally wipe it clean with a lens tissue. The cleaning method of the condenser is the same. If the specimen needs to be preserved, the cedar oil on the glass slide can be wiped clean by "pulling paper".
Cover the glass slide with lens cleaning paper, drop a drop of xylene on the paper, drag the paper strip while it is wet, and wipe it clean several times in a row.
