So if a wave slows down, its wavelength will decrease. The effect of this can be shown using wave front diagrams, like the one below. The diagram shows that as a wave travels across a boundary from ...

Refraction can cause optical illusions as the light waves appear to come from a different position to their actual source. The reverse is also true. A light ray speeds up as it passes from glass into ...

Scientists have hypothesized for over six decades the possibility of observing a form of wave reflections known as temporal, or time, reflections. Researchers detail a breakthrough experiment in which ...