The reason that the light is not refracting is that it will take the path that will take the shortest time from through the medium. ... Since, we are looking at light at normal incidence there is no path that will take shorter time than to continue straight forward in the same medium.
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Due to the symmetry of the system, there's nothing to distinguish between left and right relative to the surface. The reason that the light is not refracting is that it will take the path that will take the shortest time from through the medium. This is essentially what snell's law gives us
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