Depending on the speed of light, which depends on the medium through which light propagates, the change direction of the light rays can be more pronounced. The speed of light is higher in air than in water or glass, for example.
Like the reflection, there are also laws of refraction.
When light passes from a medium with greater speed to a medium with lower speed, the light rays are close to the normal direction (N).
In turn, when light passes from a medium with a medium-low speed for higher speed, the light rays deviate from the normal direction (N).
Refraction never happens in isolation. In fact, when the incident ray hits the surface that separates the two media, part of it is reflected and some is absorbed. Thus, the intensity of refracted light waves is always lower than the intensity of the incident waves.
Curiosity
During sunset, the sun emits light that passes through a number of different layers of the atmosphere and suffers refractions. The light arriving at the bottom of Sol is less than the deflected light from the top. That's why the sun appears flat when it's too close to the horizon. In fact, the sun is already below the horizon, but still see it because their light is bent as Einstein has predicted in his theory of general relativity, and that was proven in reality, the solar eclipse of May 29, 1919.
Video taken from this Wikipedia article.