Does light behave more like a particle, or like a wave? Today we know the surprising answer. Here's why it took so long to ...

Waves close wavesVibrations that transfer energy from place to place without the transference of matter. – including light – can be reflected at the boundary between two different materials.

Each colour within the visible light spectrum has its own narrow band of wavelength and frequency. When white light passes through a coloured filter, all colours are absorbed except for the colour ...

In particular we are interested in the geometrical aspects of propagating waves, especially their phase. In nature, one never finds the ideal plane waves described in textbooks. Real physical waves, ...

A groundbreaking achievement by physicists from Imperial College London has brought new insights into quantum physics by ...