First, the principle of microscope
In fact, the ordinary optical microscope is based on the imaging principle of the convex lens, and it has to pass through the two imaging of the convex lens.
For the first time, the objective lens (convex lens 1 ) is used for imaging. At this time, the object should be between one focal length and twice the focal length of the objective lens (convex lens 1 ). According to the principles of physics, it should be a magnified inverted real image. Then take the object image formed the first time as the "object", and pass the second imaging of the eyepiece.
When we observe, it is on the other side of the eyepiece. According to the optical principle, the image formed the second time should be a virtual image, so that the image and the object are on the same side.
Therefore, the image formed for the first time should be within one focal length of the eyepiece (convex lens 2), so after the second imaging, the image formed for the second time is an enlarged upright virtual image. If it is relative to the real object, it should be an upside-down enlarged virtual image.
Second, the use of high power microscope
1. Take the mirror and place it: hold the mirror arm with the right hand and drag the mirror holder with the left hand. Place the microscope on the bench slightly to the left at a distance of about 7 cm from the edge. Install the eyepiece and objective lens.
2. Alignment: Turn the converter to make the low magnification objective lens align with the light aperture (the distance between the front end of the objective lens and the stage should be kept 5 to 10 mm). Aim a larger aperture at the clear aperture. One eye looks into the eyepiece the other - the other eye is open. Rotate the reflector to reflect the light into the lens barrel through the clear hole. Through the eyepiece, you can see a bright white circular field of view.
3. Observation: Put the specimen to be observed on the stage, and press the specimen with the pressing clip to face the center of the light-transmitting hole. Turn the coarse focusing screw to slowly lower the lens barrel until the objective lens is close to the slide specimen. - -Look inside the eyepiece and turn the coarse focus screw counterclockwise to slowly raise the lens barrel until you can see the object clearly. Then turn the fine focus screw slightly to see the object more clearly.
4. Note for high magnification microscope: first observe with a low magnification lens to find the object image to be magnified and observed, move it to the center of the field of view, and then replace it with a high magnification objective lens. After replacing the high-power objective lens, the coarse focus screw can no longer be turned, but only the fine focus screw can be used to adjust.
