Almost all the houses there is at least a common household magnifier with a slight increase. Perhaps this simple optical instrument is rarely used, but sometimes it becomes very necessary thing.
However, few people think seriously about the multiplicity of lenses. In other words, how Magnifier enlarges objects, often the owner is not known, although knowledge of this characteristic allows for more efficient use of the device. All of the magnifier multiplicity tells this article.
What it is?
diameter of the lens and its multiplicity are the characteristics of how clear and magnified image can give a magnifying glass. For an understanding of the phrase "multiplicity magnifier" you should know that is the acceptable range for better scrutiny of things or inscriptions on them by the human eye is 25 cm (250 mm). Too close objects (for example, up to 5 cm) will be hard to consider them, as their outlines blurred.
Magnifier lens designed specifically in order to help the eye to examine items (focus) at close range. For example, a lens with a focal point of 2.5 cm will consider things at the same distance from them (2.5 cm). Thus the image quality will be worse than when placing the object and at the same distance of 25 cm. Occurs "increase" object. The multiplicity of such products will be 10 units.
What is the multiplicity and how to define it?
magnifier multiplicity also called magnification, actually increases the ability to increase or just . Learn this value is quite simple. To do this, the value of 250 (which we mentioned above) divided by the focal length in millimeters. The value in this formula is called "increase" and designated by the letters MP (Magnifying Power). Focal length is the abbreviation FL (Focal Length). The value obtained is denoted by numeral with the addition of the multiplication sign "x" (e.g., 10x).
There is an easier option to check the multiplicity of lenses. To do this, you need to know diopter. The more they are, the greater will be the increase. This method is suitable for those cases where the exact value is not important. However, not always the value obtained may be true. Theoretically, you can count all right, but in practice, the result is not entirely unexpected.
One reason may be the presence of features of human vision (such as nearsightedness or farsightedness). When an unusual location magnifying glass to count the multiplicity also will not match with reality.
Which is better?
As already mentioned, the multiplicity of the magnifying glass depends on the focal length . The latter is determined curvature. What it is more, the less focus. The smaller the focus, the more multiplicity. The smaller the diameter of the lens, which is on sale, the greater the values of its curvature and, of course, multiplicity. Thus, if the curvature is less, the diameter of the product will be greater, and the multiplicity is less. Simply put, a wide magnifying glass allows you to see a large area, but with a slight increase. Little in diameter magnifying glass increases well, but covers limited space.
Little magnifiers usually distort the subjects under consideration. When choosing a simple household magnifying glass, you will have to make a choice or in favor of the space covered, or in favor of quality. The best option is to be products with a double lens. In the case of the subsequent purchase of a dear product with several lenses, the problem of choosing between image quality and width of coverage disappears. Such installations can provide and high image clarity and wide coverage. But they are distinguished by large dimensions and impressive weight.
The highest quality materials for lenses are glass and optical polymer. Acrylic plastic is used for cheaper models.
