If a ray of light goes from a rarer medium to a denser medium, will it bend towards the normal or away from it?

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

Explanation

The angle of refraction or the amount of bending of light depends on the refractive index  of the two media.

1. When light passes through a low refractive index, like air (faster medium or optically rarer medium) to a high refractive index, like glass(slower medium or optically denser medium), its speed decreases and bends towards the normal. 

2. When light passes through a high refractive index, like glass (slower medium or optically denser medium) to a low refractive index, like air (faster medium or optically rarer medium) its speed increases and bends away from the normal.