What Does magnifying glass Mean
The concept of magnifying glass comes from the French word loupe . The term refers to a magnifying glass that usually has a handle to facilitate its manipulation.
This optical instrument has a converging lens that, by deflecting the light , produces a virtual image that magnifies the observed object . The magnifying glass is therefore used to virtually increase the size of an object that is too small for our vision.
For the magnifying glass to fulfill its function, it must be placed in front of the eye and the object under observation must appear in the focus of the lens. In general, the larger the diameter of the loupe, the greater its power.
When we meet these two positioning requirements, an image is obtained at infinity and the eyes can view it in a relaxed way rather than straining to focus. It is important to note that the human eye has the ability to focus at a minimum distance of 25 centimeters .
Since the size that is appreciated depends on the size of the resulting image on the retina, which is produced after the combination of the magnifying glass and the eye (which together form an optical system), the magnifying glass gives us an angular magnification .
The concept of angular magnification is defined as the ratio between the angle that the image occupies in the field of view and that occupied by the object when it is observed without the aid of the optical system. For this reason, the angular magnification is directly linked to the optical system, which can be a magnifying glass or a telescope, for example.
The most common use of the magnifying glass is linked to the need to "enlarge" the letters of reduced size. If a person can not read a text written in very small letters, they can use a magnifying glass to facilitate the vision and, in this way, the understanding of it.
Magnifying glasses are also associated with detectives . In fiction , in fact, the stereotype of the character usually includes the use of a magnifying glass with which the investigator looks for fingerprints or other evidence at a crime scene.
It should be noted that a magnifying glass can also be used to light a fire . When the sun's rays pass through the lens and hit a combustible material, it ends up igniting. This is because the sun is a source of energy and that the magnifying glass allows the light to be concentrated at the same point : that concentration of heat in a fuel, such as dry leaves for example, generates combustion.
Until not many years ago, the magnifying glass was also a popular item among children; Although they did not normally need it to read, it gave them different forms of fun, as if it were just another toy. In addition, the experiment of lighting a fire using sunlight can be very attractive and a starting point towards an interest in science .
At present, the massification of digital cameras has put tools for image manipulation in the hands of almost all citizens and, although mobile phones do not include a magnifying glass itself, with the help of the analog zoom we obtain a similar result when reading too small a font. In other words, the digital age buried the magnifying glass along with dozens of other instruments and gadgets from the past.
La Lupa , on the other hand, is the title of a 1955 film directed by Spanish Luis Lucia Mingarro . The story puts us in the shoes of twoMadrid detectives who are trying to solve four quite peculiar cases, which include robberies, infidelities, economic interests and alien invasions.