When let's say a beam of light passes through a transparent glass surface, how is the wave able to maintain the same frequency but the wavelength changes ?
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$c=f*\lambda$, if c changes lambda changes, but f can not change. – trula Dec 27 '22 at 16:15
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The dispersion relation (relation between frequency and wavelength) typically changes with the medium. In the case of glass and air, you can model them as non-dispersive media with different indices if refraction. – LPZ Dec 27 '22 at 16:15