Network Wiring Basics
Refraction and Reflection

Refraction and Incidence GIF

Light traveling from a lower refractive index to a higher one is bent toward the normal while light passing from a higher index to a lower index refracts away from the normal, as shown above in the top illustration. As the angle of incidence increases, the angle of refraction approaches 90 degrees to the normal. The angle of incidence that yields an angle of refraction of 90 degrees is the critical angle. If the angle of incidence increases past the critical angle (90 degrees), the light is completely reflected back into the first medium and does not enter the second.

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The Network Wiring Virtual Lecture by L. Scott Freudenthal