Thus an electron in water can travel faster than light in water. Calculate speed of light in water of refractive index 43. Calculate the index of refraction for a medium in which the speed of light is 546 10 7 ms.
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We can also use wavelengths to calculate refractive index. In 2D you can use ds2dx2dy2. This physics video tutorial discusses snells law and the index of refraction of light. Therefore it can be understood that for a medium of higher refractive index the speed of light in that medium will be slower.