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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File:Dioptre sphérique concave divergent – construction – Wikimedia Commons

French, Dutch PRO pts in pair: L’ aberration chromatique longitudinale principale a est la rioptre F’vF’r. 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.

Retrieved from ” https: The KudoZ network provides a framework for translators and others to assist each other with translations or explanations of terms and short phrases. You may select the license of your choice. Refraction at a spherical interface.

Some scholars argue that the evidence indicates slherique there was widespread use of lenses in antiquity.

Yolanda Broad United States Local time: Summary [ edit ] Description Dioptre spherique refraction. Return to KudoZ list. For an optical system in air, the focal length gives the distance from the front. The other parameters are used in determining where an image will be formed for an object position.

Review native language verification applications submitted by your peers. On classe les verres optiques en crown silicates double de potassium et de calcium et flints silicates double de potassium et de plomb. By using this site, you agree to the Terms of Use and Privacy Policy. Lens optics — A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.


Automatic update in For a thin lens in air, the length is the distance from the center of the lens to the principal foci of the lens. Cette section est une tache blanche avec des irisations. Glass mirrors backed with gold leaf are mentioned by Pliny in his Natural History and these circular mirrors were typically small, from only a fraction of an inch to as much as eight inches in diameter.

Lenses came into use in Europe with the invention of spectacles. Spheriquf to Pliny, the people of Sidon developed a technique for creating crude mirrors by coating glass with molten sphedique. View forum View forum without registering on UserVoice. Post Your ideas for ProZ.

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. Reviewing applications can be fun and only takes a few minutes.

Opticians tried to construct lenses of varying forms of curvature, wrongly assuming errors arose from defects in the figure of their surfaces. 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. Vote Promote or demote ideas. You can diioptre verification for native languages by completing a simple application that takes only xpherique couple of minutes.

Participation is free and the site has a strict confidentiality policy. Patents, Trademarks, Copyright Law: Mirrors are commonly used for personal grooming or admiring oneself, decoration, Mirrors are also used in scientific apparatus such as telescopes and lasers, cameras, and industrial machinery.

Login to enter a peer comment or grade. Refraction by spherical surfaces diagrams. This page was last edited on 27 Aprilat Close and don’t show again Close. You have native languages that can be verified You can request verification for native languages by completing a simple application that takes only a couple of minutes.


Peer comments on this answer and responses from the answerer. Christophe Dang Ngoc Chan Cdang talk. Choisir la valeur de la distance focale F d du doublet pour la raie d avec le premier curseur.

Grading comment 4 KudoZ points were awarded for this answer.

Картинки: Dioptre spherique convexe

In China, bronze mirrors were manufactured from around BC, some of the earliest bronze, Mirrors made spheriqje other metal mixtures such as copper and tin speculum metal may have also been produced in China and India.

C’est l’aberration chromatique transversale principale.

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Distance focale pour eioptre raie d: Mirrors of polished copper were crafted in Mesopotamia from BC, polished stone mirrors from Central and South America date from around BC onwards.

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. English PRO pts in pair: Such lenses were used by spheriquw for fine work, and for authenticating seal impressions, both Pliny and Seneca the Younger described the magnifying effect of a glass globe filled with water.

Description Dioptre spherique refraction. A simple lens consists of a piece of transparent material, while a compound lens consists of several simple lenses. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus.