The Fresnel Lens Posted August 31, 2018 One of the plano-convex lenses that make up Old Mackinac Point’s original lens. These simple lenses, sometimes called bullseyes, could be grouped together to project multiple beams of light. Fresnel lenses served as the heart of lighthouses around the world, including at Old Mackinac Point. Invented by French scientist Augustin-Jean Fresnel in 1819, these brass and glass beehives bent, magnified, and focused light to project brilliant beams for miles. (more…)
