The refractive index of a material defines the angle through which light is bent when it travels between a material and the vacuum. Ordinary materials such as glass have refractive indices between one ...

Pimenov told Physics Web that metallic ferromagnets should, in principle, be able to have a negative refractive index up to frequencies of 1 THz. However, he added that such materials are unlikely to ...

The physics is that of an upside-down mirage. In the tank, from top to bottom, the index of refraction is increasing, as in a mirage from the ground up. Shine the laser pointer horizontally across the ...

Physics world – Researchers in Korea have created a new metamaterial with the most extreme positive index of refraction yet – a whopping 38.6. The metamaterial operates at terahertz frequencies and ...

Students use mirror equations to determine the position and type.

What does refractive index actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.

Learn about and revise wave properties, calculations involving waves and measuring the speed of sound with GCSE Bitesize Physics.