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Fresnel light

Fresnel lenses are still in operation today. According to the US Lighthouse Society, more than 75 Fresnel lenses are in use in American lighthouses, and businesses such as Dan Spinella’s Artworks Florida craft replicas that capture the beauty — and functionality — of the 19th-century breakthrough.

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Fresnel screen

Pronounced "frennel" or "fraynel", a  Fresnel lens is a type of compact, multi-faceted lens originally developed by French physicist Augustin-Jean Fresnel for lighthouses. The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional design.  A Fresnel lens can capture more oblique light from a light source, thus allowing the light from a lighthouse equipped with one to be visible over greater distances.

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High-quality glass Fresnel lenses in lighthouses were considered state of the art in the late 19th and through the middle of the 20th centuries; most are now retired from service. However, the technology, in updated form, has many and varied uses including in car head lights, optical landing systems, and for production of solar energy.

Fresnel produced six sizes of lighthouse lenses, divided into orders based on their size and focal length. In modern use, these are classified as first through sixth order with the sixth order the smallest.  Nobska’s current Fresnel lens, pictured to the right, is a fourth order lens, a substantial size.

Fresnel Effect

The most important part of a lighthouse might be one of the beautiful tools hidden inside of it: the Fresnel lens, a breakthrough that changed seafaring and saved lives.

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As the above video shows, these lenses satisfied a need for lighthouses that could shine farther and through dense layers of fog. The Fresnel lens, invented by Augustin-Jean Fresnel, helped do that by capturing all the light coming from a lamp, then magnifying and steering it in one direction. Suddenly, lighthouses became more useful and shipwrecks diminished.

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Nobska's lens is in good working order and can be seen from the grounds - and up close if you climb the lighthouse tower.

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According to Smithsonian magazine, the first Fresnel lens was used in 1823 in southwest France near the mouth of the Dordogne River; its light could be seen from more than 20 miles. Nobska’s first Fresnel lens was installed 18 years later in 1841. The current lens was installed in 1888.

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