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I was solving a simple refraction problem where the wavelength and velocity of the sodium light needed to be calculated after refracting through glass from air. Now after calculation I found the frequency is same for the both while we know velocity = frequency $\times$ wavelength.

So is the frequency being an intrinsic property of EM waves? I know it is pretty simple but could not find a satisfactory answer.

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Normally, yes. Some generator provides a wave of a given frequency $\omega$, and the other things (wave vectors $\vec{k}$, etc.) are calculated depending on the medium where the wave travels.

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  • $\begingroup$ What are the exceptions? The first that comes to my mind is gravitational redshift. Do other exceptions exist? $\endgroup$ – Cuspy Code Jan 13 at 20:58

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