What should a reading microscope do first when aiming at light?
Reading microscope aiming at light is an important step when using microscope. When aiming at light, some students just turn an objective lens to the light hole, instead of aiming at light with a low-power mirror as required. I like to use one hand when turning the mirror, and often pull the mirror down. Therefore, when instructing students, teachers must use the low-power mirror to aim at the light. When the light is strong, they should use a small aperture and a flat mirror, while when the light is weak, they should use a large aperture and a concave mirror. The reflector should be rotated with both hands until they see a uniform and bright circular field of vision. Don't move the microscope casually after the light is aligned, so as to avoid that the light can't accurately enter the light hole through the reflector.
There are round holes with different sizes on the shutter, which are called apertures. The intensity of light can be adjusted by aiming different apertures at the light hole. Specimens are generally located in the center of the light hole for easy observation.
Magnification means the eyepiece multiple times the objective multiple. The one near the eye is called the eyepiece. The length of the eyepiece objective lens has nothing to do with the magnification. The distance between the objective lens and the slide has nothing to do with the magnification. The larger the magnification is, the smaller the number of cells in the field of vision is. The multiple has nothing to do with the brightness of the field of vision, but with the reflector and shading mirror.
Move the eyepiece, the dirt moves, then the dirt is in the eyepiece. Move the objective lens, the dirt moves, then the dirt is in the objective lens. Move the slide, the dirt moves, then the dirt is on the slide. Keep the other two still and move the other one.
First the low power mirror, then the high power mirror.
Unity: all have cell membrane, cytoplasm, ribosome and nucleic acid. All cellular organisms have DNA and RNA, and the genetic material is DNA.
Difference: the essential difference is that prokaryotes do not have a formed nucleus wrapped in a nuclear membrane.
