ElectroMagnetic Wave In Liquid.. Help with Index of Refraction?? 1. The problem statement, all variables and given/known data Consider the propagation of an electromagnetic wave in some liquid. The y-component of its electric field is given by Ey(x,t)=4.3 x104 V/m sin(5.40E-2m-1x + 6.00E+0 x106 s-1 t). How large is the index of refraction of that liquid? 2. Relevant equations 3. The attempt at a solution Honestly had no idea how to even start this problem? Any help would be great. Thanks!