Scientists have demonstrated how to manipulate light by using time-varying media in the form of specialized nanomaterials.

Light changes speed as it passes from one medium to another. This is called refraction. The frequency of light does not change as it refracts. The refractive index of a material is a measure of ...

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.

A unique feature has just occurred a couple of days before the spring equinox. We have the details on the extra daylight ...