Magnification of magnifying glass:
(1) 2-5 times: Low magnification magnifying glass, which is common in this multiple range, is the magnification of the magnifying glass used in our daily life, and is used to assist reading and browsing at most. The magnification of this magnifying glass is relatively small, mostly concentrated between 2-3 times. Using lenticular lens, its lens area is relatively large, which can meet the magnification needs of most people. Industry application requirements: watches, jewelry, antiques, electronics/semiconductors, medical care, etc.
(2) 6- 12 times: medium magnification magnifying glass, which is a bit particular. If it is an ordinary biconvex magnifying glass, its lens area is generally relatively small (which is limited by optical principles). If the area is larger, aspheric lens technology must be adopted, but in this way, the overall cost of the magnifying glass will be much higher. Daily application: reading newspapers and daily observation for the elderly; Industry applications: textile/cloth mending, jewelry, antiques, electronics/semiconductors, micro-carving, medical treatment, etc.
(3) 1.5 times or more: high magnification magnifier is generally not used for reading, but for surface inspection of various materials, such as textiles, wood, minerals, paints and dyed surfaces, and also for calligraphy and painting identification and diagnosis and evaluation of surface defects of materials. In the industrial field, it is often used to check the surface structure, but it is also used for surface repair, personal hobbies, education and scientific research. This kind of magnifying glass needs to be close to the lens when it is used because of its large magnification. Among them, watch repair and jewelry magnifying glass should be used by directly clamping the optical cup on the eye, and then moving the target to adjust the distance until the vision is clearest.