The relationship between magnification and length of microscope eyepiece and objective lens
(1) The longer the eyepiece, the smaller the magnification, and vice versa.
(2) The longer the objective lens, the greater the magnification and the closer the distance to the film; conversely, the smaller the magnification and the farther the distance from the film.
(3) The upper end of the objective lens has a thread, but the eyepiece does not.
The eyepiece is a visual optical device used to observe the image formed by the front optical system. It is a component of visual optical instruments such as telescopes and microscopes. Its main function is to magnify the real image magnified by the objective lens again. In order to eliminate aberrations, the eyepiece is usually composed of several lenses, with a larger field of view and angle of view magnification.
An objective lens is a lens group composed of several lenses. The purpose of combined use is to overcome the imaging defects of a single lens and improve the optical quality of the objective lens.
Extended information
(1) The essence of magnification: magnification refers to the length or width of magnification, not the area or volume.
(2) Calculation of magnification: The magnification of a microscope is equal to the product of the magnification of the eyepiece and the magnification of the objective lens.
(3) After switching to a high-magnification objective lens, you can no longer turn the coarse focus screw and can only adjust it with the fine focus screw.
(4) After switching to a high-power objective lens, if the field of view is too dark, you should first adjust the shutter (change to a larger aperture) or reflector (use a concave reflector) to make the field of view brighter, and then adjust the fine focus screw.
(5) When observing dark-colored materials, the field of view should be appropriately brightened, and vice versa.
