If a ray of light travels from a rarer medium to a denser medium, it will:

A light ray refracts whenever it travels at an angle into a medium of a different refractive index. This change in speed results in a change in direction. The frequency of light does not change but its wavelength changes.

If the ray of light moves from a denser to a rarer medium, the light ray moves away from the normal. If a ray of light travels from a rarer medium to a denser medium, it will bend towards the normal.