Final answer:
When a ray of light moves towards the normal when entering a second medium, it means that the index of refraction of the second medium is greater.
Step-by-step explanation:
When a ray of light moves towards the normal (the line perpendicular to the surfaces of the two media) when entering a second medium, it means that the ray is bending towards the normal. This bending of light is called refraction. The angle between the ray and the normal is less in the medium with the greater refractive index. Therefore, we can say that the index of refraction of the second medium is greater than the index of refraction of the first medium.