When the object moves to within the magnifying glass as the focal length, generate a virtual image in the mirror of the upright and amplified the same side. Therefore, by adjusting the distance between the magnifier and the object (the object distance adjustment from the near to the distant) image is the largest and most clearly the time to stop, and then carefully observed. We know that an ordinary magnifying glass is a convex lens, usually made of colorless transparent glass. Its focal length is determined by the radius of the spherical surface of the mirror of the convex lens. The magnifying glass magnifies the visual angle. The magnifying glass is especially prominent in observing small targets.
The role of a magnifying glass
A magnifying glass is used for simple visual observation optical device details of objects, is the ratio of the focal length lens eye distance much smaller. The size of an object’s image in the human retina is proportional to the angle (angle of view) of the object to the eye. The greater the angle of view, the greater the image, the better the details of the object. Moving near the object increases the angle of view, but is limited by the ability of the eye to focus. Use a magnifying glass to close to the eyes, and put an object within its focus, a positive image. The magnifying glass magnifies the visual angle.
Magnifying glass use
A magnifying glass is used for simple visual observation optical device details of objects, is the ratio of the focal length lens eye distance much smaller. The size of an object’s image in the human retina is proportional to the angle (angle of view) of the object to the eye.
1 、 inspection, processing, installation and repair of various operations in the electronics industry.
2, observe the beauty industry, facial skin pores, manicure, mining ears etc..
3, sculpture and appreciation of art.
4 、 inspection and repair of camera, clock and so on.
5, people usually use it in reading, especially for the elderly, students and other reading in dim light.
6 、 dentistry, tailoring, embroidery, etc..
7, financial, fiscal, stamp collection, jewelry, printing, agriculture and other product characteristics.
The magnifying glass is familiar to everyone. Pass water, glasses, and a newspaper. Hold most of the glass of water in the cup, so that the glass makes the water have a curved surface, just like a thick, thin, convex lens. Left hand picked up a newspaper, right hand picked up the glass, through the glass of water carefully read the words in the newspaper. What’s the difference between these words? Through the glass, reading the newspaper, the words in the newspaper are much larger. It’s the same as using a magnifying glass. This phenomenon is caused by the refraction of light. Refraction occurs when light enters glass and water. The surface of the transparent body is curved, and the refracted rays vary in angle, and the object appears to have different changes. When glass is made into a convex lens, it can make the object look bigger than the original. Once a magnifying glass is made, the focal length of it can not be changed.
Standard for magnification of a magnifier
In fact, the single lens magnifying glasses are usually at 10 times the magnification, and the common magnification of the double lens magnifier is below 20 times.
Definition: magnifier magnifier (English Name: magnifier): used to simple visual observation optical device object details, is the ratio of the focal length lens eye distance much smaller. The size of an object’s image in the human retina is proportional to the angle (angle of view) of the object to the eye.
A magnification in front of a magnifying glass, such as a 8X30, is 8 times the magnification of a magnifying glass.
If it is double rate, then two numbers are separated by symbols. 2x/4x, for example, means that the magnification of the magnifying glass is 2 times, and that in a magnifying glass there is a region with magnification of 4 times. If the lens is rectangular, then the front figure is used to indicate the width of the lens. A figure behind it indicates the height of the lens. The unit is mm. For example, “100X50” means that the width of the lens is 100 millimeters and the height is 50 millimeters. Like the telescope, the inferior magnifying glass also likes to make articles on magnification. The nominal magnification is often much higher than the real magnification. In fact, the single lens magnifying glasses are usually at 10 times the magnification, and the common magnification of the double lens magnifier is below 20 times. If the magnification requirement is high, you’ll need to use a microscope. Different occasions need to use different magnification, not the higher the magnification, good, high magnification means that the vision is small, in some occasions, vision is more important. (magnification =250/, lens focal length +1, mm units)
Desktop magnifier, magnifier or lamp, is shaped like a magnifying glass lamp like, and not two, with desktop magnifier is a desktop magnifier function is complete, but not with lamp shape such as lamp can also be called Desktop magnifier.
Desktop magnifier usually has the following characteristics:
1, there are two ways of placing: there are placed in the desktop, but also placed in the table folder placed;
2 、 double combination of magnification and illumination, select magnification according to different requirements;
3, the light is stable and reliable, no flicker, no impact on vision;
4. Advanced white lenses can be configured to reduce visual fatigue due to prolonged use;
5, the lens area is relatively large, wide vision, transmittance is higher than the ordinary magnifying glass;
6, multi position telescopic or rotatable handle (or neck), free adjustment of direction and angle of magnifying glass in large range.
7, in general, the use of desktop magnifier, you can not have a clip, magnifying glass, hand-held magnifying glass and other types of magnifying glass.
Due to the optical principle and other factors, the magnifying power of the magnifying glass is generally inversely proportional to the area of the lens. The bigger the mirror area is, the less it is. Desktop magnifier series the most common lens diameter or size above 100mm (maximum 220mm diameter), therefore, desktop magnifier magnification is destined not to go, to enlarge the scope of this size ratio of more than 10 times, it is not possible.
Therefore, desktop magnifier can not be used instead of high-power magnifying glass. If the object you need to observe needs to be magnified many times, the desktop magnifier does not completely satisfy you, which is why you need other series of hand-held magnifying glasses to assist in the observation.
In modern society, many elderly people reach a certain level in the age, there will be symptoms of presbyopia, this time, they are reading or reading the newspaper, often use a magnifying glass, so that we can see clearly the text, however, sometimes, especially in the evening, even when some of the elderly with a magnifying glass is not clear, these words, we can consider the purchase of magnifier with lamp at home for the elderly, so the elderly even in dark places can also be normal reading.
The magnifying glass and compared with the traditional Magnifier Lamp, the magnifying glass has the advantage, not only large screen, read the newspaper real vision, and strong anti falling, with soft light, night night light, coupled with the novel switch design is more unique.
1. simple and practical, easy to carry, ergonomic design, elegant appearance, comfortable hand;
2., for a wide range of applications, such as the elderly, students, factory engineers, antique collectors and so on;
3. this product has a variety of functions: suitable for field operation, as a simple map of flashlight lighting, paperwork and access to information. Is life, learning, work and travel a good helper, is the best gift for friends and family! Is suitable for units, units, social organizations, conferences, in recognition of the important program / gift a souvenir;
4., with 3 lights, LED lights (Chun Baiguangyuan), high brightness, light distribution of light evenly, the use of light is not limited, so that the effect of amplification is more clear;
The camera seems to have become a must for everyone to travel, and people who love to use photography as a souvenir often have the symptoms of where to go and where to take. In Japan, the photographer, Takashi Kitajima, also likes to use his heavy camera in his hand to leave a trail for the trip. In particular, he had more “magnifying glasses”, a secret weapon! What exactly would a special effect be if photography were combined with such an ordinary magnifying glass? Let’s have a look!
In a cloudy snow, let everyone have a magnifying glass sight focus points.
Facing the long road, I always feel that waiting for myself in front of me is a blur. In fact, we all forgot, everyone hands hold the key to clear the future.
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