The dream of a flat, lightweight telescope lens, where microscopic etchings precisely refract different wavelengths of light, ...

Researchers from the University of Science and Technology of China (USTC) have unveiled a planar optical device that ...

We’re not talking WiFi here, but plain optical signals ... driving the LED. Pair it with a photo diode for reception, and voilà—light beams become data carriers. Add a lens for focus ...

The Rekord-4 has a focal length of 52mm and was designed for a 24×36 mm film format, offering a 45-degree field of view. Its optical construction consisted of nine elements in six groups, with a ...