Frequency combs are revolutionizing optics, from telecommunications to astrophysics, but their complexity has been a ...

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 ...

The problem was that of a "black body," something that absorbs all frequencies (or wavelengths) of light. When heated it should then radiate all frequencies of light equally -- theoretically.

White light from the Sun is a mixture of colours, each with a different frequency. You can use a prism to split (or disperse) white light into a spectrum of colours: red, orange, yellow ...

This discovery meant that light was no more than an electromagnetic wave, part of the electromagnetic spectrum. Like all waves, light’s nature is defined by its wavelength – the distance ...