Curved mirrors, although lighter, can introduce distortions and chromatic aberrations, compromising image quality. Diffractive lenses, such as Fresnel plates, offer a lightweight alternative but ...

The first telescopes refracted light, and today reflectors dominate, but there is a third way to make light focus, and it ...

For centuries, telescopes have relied on curved lenses and mirrors to observe the Universe. A team of researchers has ...

First used in 1866. Linear Fresnel reflectors: Long, thin mirrors that focus sunlight to heat a liquid and power a steam generator. First developed in 1961 in Italy. While multiple solar energy ...

That's why observatory and space-based telescopes rely on massive, curved mirrors instead to achieve ... One existing type, called a Fresnel zone plate (FZP), uses concentric ridges to focus ...

A team of scientists at the University of Utah has designed a flat lens that matches the power of traditional curved lenses ...

And then there's these things called Fresnel reflectors, and these are long, thin, tiny mirrors that also focus sunlight and produce steam. So that's actually a really old technology. I mean ...

Researchers at the University of Utah developed a new flat lens for telescopes that is lighter but maintains image quality.