Does Snell's law apply in refraction when the light ray is along the normal line? Utilizing snell's law, the index of refraction (n) would be zero. nr= ni(sin θi)/sinθr Sin(θi)= 0 therefore, nr=0 However,utilizing the formula for index of refraction (n=c/v), the index of refraction would not be zero as both v and c are positive. Are light rays along the normal line and not bending refraction at all? If so, which calculation of the index of reflection is correct? Why is the other one wrong?