For the first time, scientists have demonstrated that negative refraction can be achieved using atomic arrays - without the ...

When a wave or light ray moves from one medium to another its speed changes. The direction of the ray may also change. This property of waves is called refraction and commonly occurs with light rays.

In refraction calculations, angles are always measured between rays and the normal. The change in direction of a ray depends on the change in the speed of the light and can be used to calculate ...