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total internal reflection
This term is a technical specification used primarily in physics and optical engineering. It describes a precise condition where light is trapped within a medium, creating a perfect mirror effect at the boundary. Because it describes a specific physical phenomenon, it is used in a formal, scientific register.
As a specialized technical term, it is treated as an uncountable noun. It refers to the concept or the process itself rather than a discrete object that can be counted. You would refer to "the occurrence of total internal reflection" rather than "a total internal reflection."
Meanings
The optical phenomenon that occurs when a ray of light is reflected entirely back into a medium of higher refractive index after hitting the boundary with a medium of lower refractive index at an angle greater than the critical angle.
Fiber optic cables rely on total internal reflection to transmit data over long distances with minimal loss.