Types of refraction

Diffuse refraction of light

Diffuse refraction scatters light in many angles.

Specular refraction

Specular surfaces reflect light at the same as the angle at which the light strikes the surface.

Glossy refraction

Glossy surfaces are actually specular surfaces with micro surfaces at angles to surface plane.

These micro surfaces refract light not only specularly but also diffusely (at angles very close to the specular transmission), giving the surface a glossy appearance.