Français: Construction de l’image par un dioptre sphérique concave divergent d’ un objet linéique transverse AoBo utilisant deux des trois. This Pin was discovered by Léi El. Discover (and save!) your own Pins on Pinterest. Une déformation d’une surface, d’un dioptre: a. Sphérique Entraîne un dioptre torique que l’on peut aisément calculer en prenant la kératométrie de la face.

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Focal length — The focal length of an optical system is a measure of how strongly the system converges or diverges light. The lentil plant also gives its name to a geometric figure, the variant spelling lense is sometimes seen.

File:Dioptre sphérique concave divergent – construction image.jpg

The focal length of a lens can be easily measured by using it to form an image of a distant light source on a screen. DS diopter sphere French translation: You may select the license of your choice. Login to enter a peer comment or grade. On peut aussi traduire cette variation par la relation empirique de Sellmeier: Term search All of ProZ. Most mirrors are designed for light, however, mirrors designed for other wavelengths of electromagnetic radiation are also used.

By using this site, you agree to the Terms of Use and Privacy Policy. Distance focale pour la raie d: Post Your ideas for ProZ.

File:Dioptre sphérique concave convergent – construction image – – Wikimedia Commons

In China, bronze mirrors were manufactured from around BC, some of the earliest bronze, Mirrors made of other metal mixtures such as copper and spherrique speculum metal may have also been produced in China and India. The earliest manufactured mirrors were pieces of polished stone such as obsidian, examples of obsidian mirrors found in Anatolia have been dated to around BC.


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Back focal length or back spjerique distance is the distance from the vertex of the last optical surface of the system to the focal point. According to Pliny, the people of Sidon developed a technique for creating crude mirrors by coating glass with molten lead. French, Dutch PRO pts in pair: The word lens comes from the Latin name of the lentil, the genus of the lentil plant is Lens, and the most commonly eaten species is Lens culinaris.

Choisir la valeur de la distance focale F d du doublet pour la raie d avec le premier curseur. The other parameters are used in determining where an image will be formed for an object position. The timestamp is only as accurate as the clock in the camera, and it may spheriqe completely wrong.

The oldest lens artifact is the Nimrud lens, dating back years to ancient Assyria, david Brewster proposed that it may have been used as a magnifying glass, or as a burning-glass to start fires by concentrating sunlight.

These small mirrors produced distorted images, yet were prized objects of high value and these ancient glass mirrors were very thin, thus very fragile, because the glass needed to be extremely thin to prevent cracking when coated with a hot, molten metal.

A lens can focus light to form an image, unlike a prism, devices that similarly focus or disperse waves and radiation other than visible light are also called lenses, such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses. Login or register free and only takes a few minutes to participate in this question. For a diverging lens, the length is negative, and is sppherique distance to the point from which a collimated beam appears to be diverging after passing through the lens.


A simple lens consists of a piece of transparent material, while a compound lens consists of several simple lenses.

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Curved mirrors are used, to produce magnified or diminished images or focus light or simply distort the reflected image.

Lenses came into use in Europe with the invention of spectacles. Another early reference to magnification dates back to ancient Egyptian hieroglyphs in the 8th century BC, the earliest written records of lenses date to Ancient Greece, with Aristophanes play The Clouds mentioning a burning-glass. Christophe Dang Ngoc Chan Cdang talk.

In addition, glass is very hard and scratch resistant, however, glass by itself has little reflectivity, so people began coating it with metals to increase the reflectivity.

Due spherkque the quality, high cost, and small size of these ancient glass mirrors 3. Reviewing applications can be fun and only takes a few minutes. This page was last edited on 27 Aprilat