A good rifle scope maintains optical clarity, minimizes parallax, is non-reflective and is resistant to moisture, dirt and mechanical shock. These scopes must also be suitable in a wide variety of ...

Physicists at ETH Zurich have developed a lens that can transform infrared light into visible light by halving the wavelength of incident light. The study is published in Advanced Materials. Lenses ...

Seven different vials are shown against a black background, each glowing a different color. From left to right, the vials are red, orange, yellow, green, blue, purple, and magenta. Quantum dots are ...