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Q: What is the boundary between two materials relating to light called?
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What is the boundry between two materials called?

The question is too vague for a definitive answer; depending on context, "surface", "interface", or even just "boundary" might be used.


What happens as light moves from one transparent material into a different transparent material?

IF the refractive indexes of the two materials are not the same number, and IF the light is not traveling perpendicular to the boundary between them, then the direction of the light will change at the boundary. This happens because of the slight difference in the speed of light in the two materials. The process is called "refraction" of light. Without it, eyes and other lenses would not work.


What is it called when light crosses a boundary from one substance to another?

Light refracts when is crosses the boundary between two materials. That means that is the light is coming in at one angle, then it will change direction at the interface and have a different angle moving out from the other side. There is an old formula called Snell's Law that predicts the exit angle in terms of the properties of the material, i.e. in terms of the index of refraction. There is reflection as well. Some light bounces off of a boundary and some is transmitted.


What is it called when light blends as it moves from one substance to another?

The direction of light propagation can be changed at the boundary of two media having different densities. This property is called refraction, and is illustrated in the following figure for the boundary between air and water.


The bending of a seismic wave as it crosses a boundary is called?

refractionRefraction

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