Point Reyes Lighthouse Fresnel Lens - a photo on Flickriver

"The lens in the Point Reyes Lighthouse is a 'first order' Fresnel (fray-nel) lens, the largest size of Fresnel lens. Augustin Jean Fresnel of France revolutionized optics theories with his new lens design in 1823.

Before Fresnel developed this lens, lighthouses used mirrors to reflect light out to sea. The most effective lighthouses could only be seen eight to twelve miles away. After his invention, the brightest lighthouses could be seen all the way to the horizon, about twenty-four miles.

The Fresnel lens intensifies the light by bending (or refracting) and magnifying the source light through crystal prisms into concentrated beams. The Point Reyes lens is divided into twenty-four vertical panels, which direct the light into twenty-four individual beams, radiating out over the ocean surface like the spokes of a giant wagon wheel. A weight and gears similar to those in a grandfather clock rotate the 6000-pound lens at a constant speed of one revolution every two minutes. This rotation made the beams sweep around the horizon and created the Point Reyes Lighthouse's signature pattern of one flash every five seconds."

From National Park Service, "Lighthouse History at Point Reyes." To view lighthouse exterior, click Point Reyes Lighthouse

Taken on: September 29, 2017

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Point Reyes Lighthouse

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