The essential difference between a microscope and a magnifying glass
The microscope is also an auxiliary tool for the eyes. It is mainly used to observe the minute details of close objects. It is widely used in various scientific and technical fields and is an extremely important visual optical instrument.
How a microscope works
A microscope and a magnifying glass play the same role, which is to form a magnified image of a small object at a close distance. The angle of the image to the human eye is much larger than the angle of view of the human eye when looking directly at the object.
The difference between the two is that the magnification of a magnifying glass is not high, generally below 15X; while the visual magnification of a microscope can reach more than 1,000 times.
The structure of a magnifying glass is relatively simple, usually just a set of lenses, which is essentially one-time magnification; while the structure of a microscope is more complex, usually two sets of lenses, which is essentially two-time magnification.
The principle of secondary magnification of a microscope is to first use a lens with a short focal length to turn a small object into a magnified real image, that is, to magnify the object several times laterally, and then use a magnifying "magnifying glass" to observe the horizontally magnified primary image. .
Things to note about metallographic microscopes
1. When holding the mirror, you must hold the arm with your right hand and the holder with your left hand. Do not pick it up with one hand to avoid parts falling off or colliding with other places.
2. Handle it with care. Do not place the microscope on the edge of the experimental table to avoid knocking it over and falling to the ground.
3. Keep the microscope clean. The optical and lighting parts can only be wiped with lens cleaning paper. Do not blow your hands or wipe with a cloth. Use a cloth to wipe the mechanical part.
4. Do not let water droplets, alcohol or other chemicals come into contact with the lens and stage. If contaminated, clean it immediately.
5. When placing the slide specimen, align it with the center of the light hole, and do not place the slide upside down to prevent the slide from being crushed or the objective lens from being damaged.
6. Develop the habit of opening both eyes at the same time. Use the left eye to observe the field of vision and the right eye to draw.
7. Do not remove the eyepiece at will to prevent dust from falling into the objective lens, and do not disassemble various parts at will to prevent damage.
