The question is too vague for a definitive answer; depending on context, "surface", "interface", or even just "boundary" might be used.
Light waves are refracted at a boundary between two materials because the speed of light changes as it passes from one material to another, causing a change in direction. This change in speed is due to the change in the optical density of the materials, leading to a bending of the light wave.
The wave is called a "reflected wave" when it bounces back off the boundary between two different materials.
The boundary between two materials relating to light is called a interface. This is where light rays can be reflected, refracted, or absorbed as they pass from one material to another.
The electrical charge that is built up by friction between two dissimilar materials is called static electricity. This occurs when electrons are transferred from one material to another, resulting in an excess of either positive or negative charge on the surfaces of the materials.
The amount of refraction that occurs at the interface between two materials depends on the difference in their refractive indices. A greater difference in refractive indices between two materials will result in a larger amount of refraction.
It is the fault.
The boundary between two materials is called an interface.
There are two: the Urals and the Caucuses.
The bending of a wave at the boundary between two media is called refraction. This occurs when the wave changes speed as it moves from one medium to another, causing it to change direction.
transform boundry as in the san Andreas fault
earthquake
Light waves are refracted at a boundary between two materials because the speed of light changes as it passes from one material to another, causing a change in direction. This change in speed is due to the change in the optical density of the materials, leading to a bending of the light wave.
norft unscrambled is front, as in weather front or boundry between two different air masses is called a norft (again it is scrambled if doing homework)
Rio Grande
its convergent!
The wave is called a "reflected wave" when it bounces back off the boundary between two different materials.
The boundary between two materials relating to light is called a interface. This is where light rays can be reflected, refracted, or absorbed as they pass from one material to another.