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Fresnel Lenses
- Oct 15, 2018 -

Fresnel lens, also known as screw lens, is made of laminated polyolefin materials, and also made of glass. One side of the lens surface is smooth, while the other side records concentric circles from small to large.

The Fresnel lens was invented by the French physicist Augustin Fresnel, who first used it in 1822 to design a system of glass Fresnel lenses, the lighthouse lens.
The idea of making thinner and lighter lenses by mounting several separate sections on a frame is often thought to have been suggested by the earl of burguan. Condorcet (1743-1794) proposed grinding such lenses with a single sheet of thin glass. And the French physicist and engineer frenel also has high hopes for this kind of lens in the lighthouse application. In 1823, according to the smithsonian, the first Fresnel lens was used on the Phare DE Cordouan at the mouth of the gironde; Light emitted through it can be seen from 20 miles (32 kilometers) away. The Scottish physicist Sir David brewster was seen as the driving force behind Britain's use of such lenses in lighthouses.

Author:Bunny Sun