What is the frequency of light, which has a wavelength in air of 546 nm ? What is its frequency

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What is the frequency of light, which has a wavelength in...

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Key Concepts

Frequency of Light

Frequency is the number of oscillations or cycles a wave completes per second and is determined solely by the source of the light. In the context of light moving between different media, the frequency remains constant even though the wavelength and speed may change.

Speed of Light in Different Media

The speed of light is a constant in a vacuum; however, when light travels through a medium, its speed is reduced by the refractive index of that medium. The relation is given by v = c/n, where c is the speed of light in vacuum and n is the refractive index.

Refractive Index

The refractive index of a medium indicates how much the speed of light is reduced inside that medium compared to its speed in a vacuum. It is a dimensionless number that quantifies the optical density of the medium and plays a key role in determining both the speed and the wavelength of light in the medium.

Wavelength in Different Media

Wavelength is the distance between successive crests of a wave. When light enters a medium other than vacuum, its speed decreases and, because the frequency remains unchanged, the wavelength must decrease proportionally. The relationship is expressed as ?_medium = ?_vacuum / n.

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