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What is the maximum multiplier of a handheld magnifier?
Release time:2017-12-13 browse:497second

Magnifier is a use of a convex lens, it is the distance is less than the focal length, get an enlarged virtual image. When the object changes, like distance change, the rule is: 1/ +1/ distance image distance =1/ focal length.


To use magnifier and regulation: as in photopic distance (25 cm) when the magnification magnification of the magnifying glass. So the following formula can be derived: magnification =1+25/f. F is the focal length, the unit is centimeter.


The above formula can be calculated.


1, 30 times the magnifying glass, the focal length f=0.86 cm;


2. The magnifier with a focal length of 50px is 13.5 times the multiple.


The larger the central thickness of the magnifying mirror, the larger the magnification and the smaller the field of vision; the smaller the center thickness, the smaller the magnification and the larger the field of vision.


The interpretations of the magnifying mirror: for example, the 10X is 10 times that of the 10X21MM mark, and the diameter of the 21MM magnifier lens.


The focal length of the magnifying mirror: the distance between the lens and the object when the eye sees the most clearly.


Magnifying mirror field of vision interpretation: the diameter of the eye, when the eye is most clearly visible, is seen on the edge of the image without a distortion range.


An optical amplification system with an adjustable focal length is called a microscope. An optical amplification system without a regulated focal length is called a magnifying glass. The magnification of different magnifying mirrors is different, the shorter the focal length is, the greater the multiple of the focal distance, and the smaller the longer the focal length. The view of the magnifying glass is also proportional to the multiplier, the smaller the larger the multiples, the larger the view of the smaller the multiple.


A standard 10 times magnifying glass, its standard focal length is 25MM, the largest field of vision is 23MM, and a standard 30 times magnifying glass, its standard focal length is 8MM, the largest vision is around 6MM. If a magnifier is marked 30 times, but the actual focal length is not 8MM, we can make sure that the magnifier is 30 times the false.


The common magnification of single lens magnifier is less than 10 times, and the common rate of double lens magnifier is less than 20 times. Good imaging, no aberration, no color difference, distortionless magnifying glass should be made of high quality optical lenses with three or three layers of glue to achieve the desired results.


How many times the maximum multiplier of a handheld magnifier can be? Generally, the maximum number of the handheld magnifier is 30 times the maximum because of the standard focal length. A magnifier with a standard multiplier of 30 times (no) or more, must be added to the focus device to see clearly. If a magnifying glass without a focusing device is rated 35 times, 40 times or more times, it can be determined that the magnifying glass is a magnifying glass with a false magnification. When the rate is high, it is necessary to use a microscope. Different occasions need to use different times, not the higher the ratio, the higher the ratio means small field of vision, in some occasions more important field of vision.


The focal length of a microscope is very short. No matter it is a portable microscope or a desktop microscope, there will be a device for adjusting focal length on the device, so that it can stabilize the imaging effect and achieve the clearest.


The selection of magnifying glass multiplier needs to be selected according to the conditions used. If used for reading newspapers, magazines, books and other reading magnifying glasses, you can choose 2-5 times the magnification of the magnifying glass. If used for identification and identification of fine objects, high magnifying glasses must be used, such as jewelry identification, jade identification, porcelain identification, stamp identification, calligraphy and painting identification, etc. it needs about 10 times to 20 times magnifying magnification.


The magnifying glass is an optical device, and it is actually a high precision optical device. A cheap magnifying glass, blurred imaging, especially the edge of the magnifier, is very blurred and deformed. Long term use affects people's eyesight. Short time use, such as the use of more than 1 minutes, a cheap magnifying glass, because the imaging is unstable, can make people feel nauseous.


So as a long-term use of the population, such as the elderly, we must buy an international brand magnifying glass, the price is generally more than 200 yuan. The use of cheap magnifying glasses in the elderly can seriously affect vision, especially for elderly people with cataracts, which will be more harmful to the eyes.


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