1. installation difficulty
Install the eyepiece and objective lens of the optical microscope before using it. The installation of the eyepiece is quite straightforward, however the objective lens is where most issues arise. Since the objective lens is relatively expensive, it is simple for it to fall to the ground and harm the lens if the thread is not properly closed when the student installs it. It is urged that students should install the objective lens when doing so in order to ensure their safety. Holding the objective between your left index and middle fingers and mounting it with your right hand can prevent it from falling even if it is not mounted properly.
2. The problem of light
Lighting is a very important step when using a microscope.Instead of utilizing a low magnification lens as instructed when looking for light, some students arbitrarily turn an objective lens to face the transparent hole. When turning the mirror, I frequently drag it down with one hand. Teachers must therefore highlight the usage of low-power mirrors for illumination when training students. Use a small aperture and a flat mirror when the light is strong, and a big aperture and a concave mirror when the light is faint. Use both hands to revolve the reflector. to a circular field of view that is consistently bright. After the light is aligned, avoid carelessly moving the microscope to prevent inaccurate light entry into the clear hole by reflection in the reflector.
3. The issue with correctly operating the quasi-focus screw
The most critical and challenging part of using a microscope is teaching students how to utilize the focus screw to detect the object image and alter the focal length. During the procedure, students are prone to making the following errors:
Direct focus adjustment with a strong magnifying lens;
b. The eyes are always focused on the field of view in the eyepiece, regardless of whether the lens barrel is rising or falling;
c. It is unclear what the object distance's critical value is. It continues to rise and the quasi-focus screw is turning at a very rapid pace when the object distance is set to 2-3 cm.
When students use microscopes, the third error is the most frequent occurrence since the first two types of errors frequently result in the objective lens interfering with the mount and damaging the mount or lens.
4. The issue with the conversion of objective lenses
Use a high magnification lens after using a low magnification lens. Because the converter's material is soft and highly precise, students frequently prefer to push and turn the objective lens with their fingers, thinking that this will save them time. However, because the thread is easily loosened by uneven force, the optical axis of the objective lens is easily skewable. The entire converter is thrown out if the thread breaks. Students should be taught to grip the converter's lower spinning plate while converting the objective lens.
5. The problem of using the eyes correctly
Both eyes should be open at the same time when using a microscope, and the left eye should be directed toward the eyepiece. But a lot of pupils frequently fail to accomplish this. They frequently close their right eye or cover it with their hands, which is contrary to the experiment's observational requirements. to watch and to sketch. The teacher should give a tangible demonstration while pointing out the students' issue, instructing the students to keep their left eye as close to the eyepiece as possible and to try to gaze into the field of vision with their right eye. Repeated practice in this manner will result in the required simultaneous opening of both eyes for observation.
