# A report onWavelength and Refraction

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

- Refraction

This change in speed upon entering a medium causes refraction, or a change in direction of waves that encounter the interface between media at an angle.

- Wavelength

## Light

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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).

This change of direction is known as refraction.

## Refractive index

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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 determines how much the path of light is bent, or refracted, when entering a material.

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.

## Dispersion (optics)

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Phenomenon in which the phase velocity of a wave depends on its frequency; sometimes the term chromatic dispersion is used for specificity to optics in particular.

Phenomenon in which the phase velocity of a wave depends on its frequency; sometimes the term chromatic dispersion is used for specificity to optics in particular.

In optics, one important and familiar consequence of dispersion is the change in the angle of refraction of different colors of light, as seen in the spectrum produced by a dispersive prism and in chromatic aberration of lenses.

The most familiar example of dispersion is probably a rainbow, in which dispersion causes the spatial separation of a white light into components of different wavelengths (different colors).

## Electromagnetic radiation

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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.

In refraction, a wave crossing from one medium to another of different density alters its speed and direction upon entering the new medium.

## Sound

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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.

During propagation, waves can be reflected, refracted, or attenuated by the medium.

## Wind wave

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Water surface wave that occurs on the free surface of bodies of water.

Water surface wave that occurs on the free surface of bodies of water.

Wave length (distance from crest to crest in the direction of propagation)

Wave refraction is the process that occurs when waves interact with the sea bed to slow the velocity of propagation as a function of wavelength and period.

## Dispersive prism

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Optical prism that is used to disperse light, that is, to separate light into its spectral components .

Optical prism that is used to disperse light, that is, to separate light into its spectral components .

Different wavelengths (colors) of light will be deflected by the prism at different angles.

This speed change causes the light to be refracted and to enter the new medium at a different angle (Huygens principle).