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From the elementary texts, dispersion is the phenomenon where the refractive index of a medium depends on the wavelength of electromagnetic radiation through it. From what I've read, it is the wavelength of the radiation

My question is simple, by wavelength, are they referring to the 'new' wavelength as the light passes through the material or are they referring to the wavelength in vacuum? About frequency, I don't really have much question about it, at least if I believe that the frequency stays constant even after going through different mediums.

If we go by the equation [tex]\lambda=\frac{\lambda _o}{n}[/tex] I can see that they must be referring to the 'new' wavelength, but this is still a bit baffling for me. I'd like to ask more but maybe after someone replies on this. I probably just missed something.

Edit: I'm starting to get the hunch that I'm might be using the wrong model/mathematical expression for this.

**in vacuum**. Also, it is said that the refractive index increases with decreasing wavelength, and increasing frequency.My question is simple, by wavelength, are they referring to the 'new' wavelength as the light passes through the material or are they referring to the wavelength in vacuum? About frequency, I don't really have much question about it, at least if I believe that the frequency stays constant even after going through different mediums.

If we go by the equation [tex]\lambda=\frac{\lambda _o}{n}[/tex] I can see that they must be referring to the 'new' wavelength, but this is still a bit baffling for me. I'd like to ask more but maybe after someone replies on this. I probably just missed something.

Edit: I'm starting to get the hunch that I'm might be using the wrong model/mathematical expression for this.

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