Light bends when travelling through a concentration gradient of sugar in water. The top layer of liquid is pure water while the bottom layer is concentrated sugar water. In these layers, there is no ...

Scientists have demonstrated that negative refraction can be achieved using atomic arrays -- without the need for artificially manufactured metamaterials. Scientists have long sought to control light ...

The reverse is also true. A light ray speeds up as it passes from glass into air, and bends away from the normal by the same angle. Slide 1 of 3, Light ray hits glass block at right angles to surface.