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Review Of How To Calculate Speed Of Light Using Snell& 39 Ideas . Refraction occurs because the speed of the light changes when it passes into a new medium. Web assume the index of refraction of air to be 1 or 1.003 snell's law: The FOA Reference For Fiber Optics Total Internal Reflection In from foa.org Snell’s law allows us to work out the index of refraction of light through an object. This of course is impossible, and the light in such cases is completely reflected by the boundary, a phenomenon known as total internal reflection N = c v, (25.3.3) (25.3.3) n = c v, where v v is the observed speed of light in the material.