The blending of light as it moves from one substance to another is called refraction.

Here's a breakdown:

* Refraction: The bending of light as it passes from one medium to another (like air to water). This happens because light travels at different speeds in different substances.

* Why it "blends": The bending of light causes the different colors that make up white light to separate, creating a spectrum (like a rainbow). This creates the appearance of "blending" as the colors mix together.

Let me know if you have any other questions about light!