a qualitative answer is that it is bent toward the normal and remains in the plane of incidence. This means that the incident ray, the refracted ray and the normal to the surface all lie in the same plane. Asked hoe much the ray is bent, you might answer that the greater the angle the incident ray makes with the normal, the more it is bent. You might even risk the guess that the angles the incident and refracted rays make with the normal are proportional.