Question by D B: The laser used in cornea surgery to treat corneal disease is the excimer laser,which emits ultraviolet light,?
with a wavelength of 193 nm in air . The index of refraction of the cornea is 1.376. What are the wavelength and frequency of the light in the cornea?
Best answer:
Answer by kirchwey
The frequency stays the same. It is c/wavelength (in vacuum). The nominal wavelength change factor in refraction is n0/n1, or in this problem, 1/1.376. Dispersion is an effect that changes the actual factor from the nominal factor depending on the nominal wavelength. This is a factor that does not have a simple formula; many dispersion formulas and parameters are given for different types of refractive media. Since the dispersion factor isn’t given, the only possible answer is 193/1.376 nm. (The index of refraction of air is usually assumed equal to that of vacuum, 1.0.)
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