2 thoughts on “What is the most suitable distance between the magnifying glass and the object?”
Christina
When the convex mirror is used, the object should be placed within 1 times the focal length, and a positive zoom image is formed on the same side. Therefore, when observing the small objects, the magnifying glass should be placed above the object to make the object within the focus.
In order to see the details of the tiny objects or objects, the object needs to be moved closer to the eyes. This can increase the perspective and form a large image on the retina. But when the object is too close to the eye, it cannot be seen clearly. In other words, you must not only make the objects have a large corner of the eye, but also take the right distance. Obviously, these two requirements are restricted by each other. If a convex lens is configured in front of the eyes, this problem can be solved. The convex lens is the simplest magnifying glass, which is a simple optical instrument that helps the eyes to observe small objects or details. Observation method 1: Let the magnifying glass go close to the observation objects, the observation object does not move, the distance between the human eyes and the observation object remains unchanged, and then move the hand -holding mirror between the object and the human eye. clear.
Observation method 2: A magnifying glass to the eyes. The magnifying glass is not moving, the moving object is clear until the image is large and clear. In convex lens as an example, calculate its amplification skills. Put the object PQ on the focus of the lens L and the lens and make it close to the focus, so the object is a magnified virtual p -Q ′ through the lens. If the square focal length of the convex lens is 10cm, the amplifier of the magnifying glass made of the lens is 2.5 times, and it is written as 2.5 ×. If you only consider the amplification skills, the focal length should be shorter, and it seems that this can get the ability to make any Aptutics. However, due to the existence of the aberration, the enlarged basis is generally 3 ×. If a duplex amplifier (such as a mirror) is used, the aberration can be reduced and the amplifier can reach 20 ×. The magnifying glass can be divided into portable magnifying mirrors and desktop amplifiers according to the appearance classification. The desktop amplifier mirror can be fixed. There is a base below. The top of the magnifying glass can be rectangular or square, or round, or round. In shape, such a magnifying glass is mainly used for long -term fixation.
The mirror arm that can be long in the mirror of the mirror is very long.
The portable magnifying glass is like the top. There is a handle behind the round magnifying glass in front. There are many types of portable magnifying glass. It is mainly easy to carry and observe. The portable amplifier also has a light source and no light source. There are many benefits when watching the magnifying glass with light sources, and the light remains stable.
For gemstone identification, the multiplier rate of jewelry is not as big as the greater the better, because from the perspective of the lens, it can ensure its optical quality and the light caliber (the light caliber of the magnifying glass, from 16 mm to 20 20 to 20. It is very difficult for millimeters); in addition, more than 10 times the magnifying glass is difficult to use due to the short focal length.而使用十倍放大镜时，固定物至镜头顶端的距离2.5cm是最适当的距离；若用20倍的放大镜，则其物与径的距离仅1cm，观察很不方便； 一个重要的原因是， Internationally observing the quality of colored gemstones is determined by the naked eye observation, and diamond quality observation is standard for 10 times. In view of the above reasons, the jewelry industry is observed with jewelry with 10 times large mirror.
When the convex mirror is used, the object should be placed within 1 times the focal length, and a positive zoom image is formed on the same side. Therefore, when observing the small objects, the magnifying glass should be placed above the object to make the object within the focus.
In order to see the details of the tiny objects or objects, the object needs to be moved closer to the eyes. This can increase the perspective and form a large image on the retina. But when the object is too close to the eye, it cannot be seen clearly. In other words, you must not only make the objects have a large corner of the eye, but also take the right distance. Obviously, these two requirements are restricted by each other. If a convex lens is configured in front of the eyes, this problem can be solved. The convex lens is the simplest magnifying glass, which is a simple optical instrument that helps the eyes to observe small objects or details.
Observation method 1: Let the magnifying glass go close to the observation objects, the observation object does not move, the distance between the human eyes and the observation object remains unchanged, and then move the hand -holding mirror between the object and the human eye. clear.
Observation method 2: A magnifying glass to the eyes. The magnifying glass is not moving, the moving object is clear until the image is large and clear.
In convex lens as an example, calculate its amplification skills. Put the object PQ on the focus of the lens L and the lens and make it close to the focus, so the object is a magnified virtual p -Q ′ through the lens. If the square focal length of the convex lens is 10cm, the amplifier of the magnifying glass made of the lens is 2.5 times, and it is written as 2.5 ×. If you only consider the amplification skills, the focal length should be shorter, and it seems that this can get the ability to make any Aptutics. However, due to the existence of the aberration, the enlarged basis is generally 3 ×. If a duplex amplifier (such as a mirror) is used, the aberration can be reduced and the amplifier can reach 20 ×.
The magnifying glass can be divided into portable magnifying mirrors and desktop amplifiers according to the appearance classification. The desktop amplifier mirror can be fixed. There is a base below. The top of the magnifying glass can be rectangular or square, or round, or round. In shape, such a magnifying glass is mainly used for long -term fixation.
The mirror arm that can be long in the mirror of the mirror is very long.
The portable magnifying glass is like the top. There is a handle behind the round magnifying glass in front. There are many types of portable magnifying glass. It is mainly easy to carry and observe. The portable amplifier also has a light source and no light source. There are many benefits when watching the magnifying glass with light sources, and the light remains stable.
For gemstone identification, the multiplier rate of jewelry is not as big as the greater the better, because from the perspective of the lens, it can ensure its optical quality and the light caliber (the light caliber of the magnifying glass, from 16 mm to 20 20 to 20. It is very difficult for millimeters); in addition, more than 10 times the magnifying glass is difficult to use due to the short focal length.而使用十倍放大镜时，固定物至镜头顶端的距离2.5cm是最适当的距离；若用20倍的放大镜，则其物与径的距离仅1cm，观察很不方便； 一个重要的原因是， Internationally observing the quality of colored gemstones is determined by the naked eye observation, and diamond quality observation is standard for 10 times. In view of the above reasons, the jewelry industry is observed with jewelry with 10 times large mirror.