Final answer:
When light travels at an angle into a denser medium, it refracts toward the normal, which means the light ray bends towards the line perpendicular to the surface. The angle between the ray and the normal is less in the medium with the greater refractive index.
Step-by-step explanation:
In the context of refraction, when light travels at an angle into a denser medium, it refracts toward the normal. This means that the light ray bends towards the line perpendicular to the surface of the two media.
For example, when light travels from air (less dense) into water (denser), it bends towards the normal. This can be observed when a pencil is placed in a glass of water, where the portion of the pencil in water appears to be bent.
The angle between the ray and the normal is less in the medium with the greater refractive index, which is responsible for the change in direction of the light ray.