Network Wiring Basics
Refraction and Reflection

If one were to stand on a pier and look directly down at a fish, the light would not be refracted, so the fish would be in its apparent position, but if one were to view that same fish at an angle, refraction of light would occur and the fish would appear closer to the surface. What appears to be a straight line from the fish to the eye is actually a line with a bend where the light passes from water into air and is thus refracted resulting in the fish actually being deeper in the water than it appears.

Fishie Refraction GIF

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The Network Wiring Virtual Lecture by L. Scott Freudenthal