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A Fresnel lens is a compact lens that reduces the amount of material required compared to a conventional lens by dividing it into concentric sections. Learn about the invention by Augustin-Jean Fresnel, the different designs and uses of Fresnel lenses in lighthouses and other applications.
A Fresnel rhomb is an optical prism that introduces a 90° phase difference between two perpendicular components of polarization, by means of two total internal reflections. Learn about its operation, history, and applications in polarization experiments and devices.
The Fresnel equations describe the reflection and transmission of light at an interface between different optical media. They were derived by Augustin-Jean Fresnel, who was the first to understand that light is a transverse wave and polarization.
Homonymous hemianopsia is a visual field loss on the same side of both eyes, caused by brain injury or damage. Learn about its signs, symptoms, causes, diagnosis, and management, as well as related terms and references.
The Peli Lens is a device that expands the visual field of people with homonymous hemianopia, a condition that affects one side of the visual field. It was developed by Dr. Eli Peli and uses Fresnel prisms to create an optical illusion of peripheral vision.
Learn about the life and achievements of Augustin-Jean Fresnel, a French engineer and physicist who developed the wave theory of light and invented the Fresnel lens. The Fresnel lens is a type of optical device that uses a series of concentric rings to focus light over a wide angle.
Arago spot is a bright point in the center of a circular shadow due to Fresnel diffraction, which demonstrates the wave nature of light. Learn about the history, theory and experiment of this phenomenon, and how it relates to quantum mechanics.
Lloyd's mirror is an optics experiment that was first described in 1834 by Humphrey Lloyd in the Transactions of the Royal Irish Academy. [1] Its original goal was to provide further evidence for the wave nature of light, beyond those provided by Thomas Young and Augustin-Jean Fresnel.