# A report onWavelength

Spatial period of a periodic wave—the distance over which the wave's shape repeats.

- Wavelength

## Light

Electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye.

Electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye.

Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).

In physics, electromagnetic radiation (EMR) consists of waves of the electromagnetic (EM) field, propagating through space, carrying electromagnetic radiant energy.

In physics, electromagnetic radiation (EMR) consists of waves of the electromagnetic (EM) field, propagating through space, carrying electromagnetic radiant energy.

The position of an electromagnetic wave within the electromagnetic spectrum can be characterized by either its frequency of oscillation or its wavelength.

## Electromagnetic spectrum

The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.

## Refractive index

Optical medium is a dimensionless number that gives the indication of the light bending ability of that medium.

Optical medium is a dimensionless number that gives the indication of the light bending ability of that medium.

The refractive index can be seen as the factor by which the speed and the wavelength of the radiation are reduced with respect to their vacuum values: the speed of light in a medium is v = c/n, and similarly the wavelength in that medium is λ = λ0/n, where λ0 is the wavelength of that light in vacuum.

## Frequency

Number of occurrences of a repeating event per unit of time.

Number of occurrences of a repeating event per unit of time.

For periodic waves in nondispersive media (that is, media in which the wave speed is independent of frequency), frequency has an inverse relationship to the wavelength, λ (lambda).

## Refraction

Redirection of a wave as it passes from one medium to another.

Redirection of a wave as it passes from one medium to another.

The refractive index of materials varies with the wavelength of light, and thus the angle of the refraction also varies correspondingly.

## Wave

Propagating dynamic disturbance of one or more quantities.

Propagating dynamic disturbance of one or more quantities.

Electromagnetic waves, according to their frequencies (or wavelengths) have more specific designations including radio waves, infrared radiation, terahertz waves, visible light, ultraviolet radiation, X-rays and gamma rays.

## Visible spectrum

Portion of the electromagnetic spectrum that is visible to the human eye.

Portion of the electromagnetic spectrum that is visible to the human eye.

Electromagnetic radiation in this range of wavelengths is called visible light or simply light.

## Sound

Vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.

Vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.

In air at atmospheric pressure, these represent sound waves with wavelengths of 17 meters to 1.7 cm.