Initially, Fresnel lenses were the shining stars of lighthouses, focusing beams to reach greater distances across the seas. But their application didn't stop there. Today, plastic Fresnel lenses are popular as magnifiers, while glass Fresnel lenses have specialized uses in various fields.

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From giant Fresnel lenses concentrating sunlight for solar energy to their use in cameras and traffic signals, these lenses have found their way into various modern applications. Their ability to produce a powerful light beam, combined with their lightweight design, makes them invaluable in many sectors.

When light passes through a lens, it bends or refracts. The angle and thickness of the lens determine how much the light bends. In a Fresnel lens, each concentric ring has a specific angle and thickness to ensure light rays converge at a single point or focus.

Léonor Fresnel, a relative of Augustin Jean Fresnel, also made significant contributions to the wave theory of light. It seems that a passion for optics ran in the family!

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Fresnel lens — it might sound like a fancy term, but its concept is simple. Imagine a conventional lens, thick in the middle and tapering to the edges, much like a lentil. Now, what if you could flatten the lens surface without losing its magnifying power? Enter the Fresnel lens.

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Ever gazed at a lighthouse beam and wondered how it shines so brightly across vast distances? Or perhaps you've used a thin plastic magnifier and been amazed at its ability to enlarge tiny text?

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Not all light is the same. Polarized light, for instance, vibrates in a specific direction. Lenses, including the Fresnel type, can affect how polarized light passes through. Additionally, lenses can sometimes cause chromatic aberration, where different colors of light focus at different points. It's a challenge that lens designers constantly work to overcome.

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The magic behind the lighthouse lense and these other wonders is the Fresnel lens. Let's dive into the fascinating world of this unique lens and discover how it works.

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The Fresnel lens is named after its creator, French physicist Augustin Jean Fresnel. In the 19th century, Fresnel delved deep into the world of light and optics. His studies led to the invention of this lens, which revolutionized lighthouse illumination.