What is the Fresnel lens?
Fresnel Lens is a glass or plastic lens originally invented to improve the abilities of the lighthouse. Fresnel lens, which consists of concentric angle rings of the material, uses these rings to focus light on the central part of the lens. Although Fresnel lenses are not common today, they have many other applications.
Augustin-Jean Fresnel is credited with the invention of Fresnel lenses. The French inventor fascinated the properties of light, Fresnel worked considerably on scientific theories of light acting as a wave. Experts believe it was his research into the characteristics of light that gave him the idea of a lens that would be called his name; The first of his lenses was installed around 1823 in the Cordouan lighthouse in France.
up to Fresnel development, the range of the lighthouse was a serious problem for ships at sea. The Fresnel lens significantly expanded the ability of the beacons and created rays visible to more than 20 miles (32 km). Unlike traditional-concrete lens previously popular in the Majes, concentric Fresn circlesElo reduced the desired lens thickness and were often significantly lighter than the loading one-piece plano-convex models.
Today, fresney is made of glass or plastic and have found many modern uses. Thanks to the mechanical processes of the amplification of the glass inclinations, the angles of the lens and the concentric construction can be improved into a single piece of material rather than individually carved and assembled. One of the most common uses of the fresnel is traffic lights, where a strong, but not particularly high -quality beam of light is required for operation.
Fresnels are popular for several purposes in theater and film productions. The lenses developed for movies and theater are very flexible in design, allowing lighting techniques to easily adjust light from clear focused beam into flooded positioning allows lighting. The lights are also highly valued for their ability to create hard edges, clean shadows on stage or in ran ammper. These shadows allow the light to be better manipulated and controlled, providing lighting techniques to create specific nuances of light.
One of the common mistakes in talking about the Fresnel lens is an incorrect advantage. It is a sign of a beginner who pronounces the word as written, with a vocalized "S". The word is almost constantly pronounced as "Fre-Neb", with "s" remaining silence.