In physics, the wavelength of a sinusoidal wave is the spatial period of the wave – the distance over which the wave's shape repeats. It is usually determined by considering the distance between ...

Optical materials with a dielectric constant near zero have the unique property that light advances with almost no phase advance. Although such materials have been made artificially in the microwave ...

As a wave of light travels through the universe, does it lose energy? For example, what is the wavelength of 450 nm (blue) light after traveling a trillion (1,000,000,000,000) km in the universe?

A research team in South Korea has developed a next-generation sensor material capable of integrating the detection of ...

Understanding diffraction and dispersion is key to optical science, influencing technologies like spectroscopy, fiber optics, ...

Measuring the distance to truly remote objects like galaxies, quasars, and galaxy clusters is a crucial task in astrophysics, particularly when it comes to studying the early universe, but it's a ...