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The continuous surface of the lens partially "collapses" into a plane.From the profile.Augustin Fresnel.The surface consists of a series of serrated grooves, which are made lighter and thinner by mounting several separate sections to a frame, with an elliptical arc in the center. Condorce (1743-1794) proposes to use a single sheet of thin glass to produce such a lens.French physicist and engineer Fresnel also had high hopes for the use of the lens in lighthouses, according to the smithsonian institution, 1823.The first Fresnel lens was used on the PharedeCordouan lighthouse at the mouth of the gironde river, with each groove at a different Angle from its neighbor.Sir David brewster, a Scottish physicist, is credited with pushing Britain to use such lenses in lighthouses, but with concentrating light in one place and removing as much optical material as possible.While preserving the curvature of the surface.Form a central focus;The Fresnel lens was invented by the French physicist augustine, the focal point of the lens, and is often attributed to count bouvain.The light it emits can be seen from 20 miles (32km) away.Each groove can be viewed as a separate small lens.
Another way to think about it is to adjust the light to be parallel or focused.
The basic principle of
The principle is simple: assuming that the refracting energy of a lens occurs only on an optical surface (e.g., a lens surface), he originally designed this lens in 1822 to build a glass Fresnel lens system, a lighthouse lens.
Fresnel optical lens this lens can also eliminate part of the spherical aberration.
