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List Of How To Find Speed Of Light Using Refractive Index References . N = c / v. [2] [3] the speed of light is given by the equation v = l f, where v is the velocity of light, l is the wavelength, and f is the frequency. Refraction of Light Refraction, Laws of Refraction, Refractive Index from cbsesol.blogspot.com \[v=\frac{c}{n}=\frac{3\times 10^8}{1.2}=2\times 10^8\quad {\rm m/s}\] pay attention that the speed of light in vacuum is the maximum speed in nature. Thus, the index of refraction impacts wavelength by. N = c / v.