What is meant by TIR?
We all know that a diamond sparkles brightly. But do you know why? To begin with, a diamond is cut so that it has many surfaces at different angles to each other. It sparkles because light bounces to and Iro off the inside of its many surfaces, and produces the Hashes of light that we see. This is an example of total internal reflection, or TIR.
To understand TIR, we must understand that when light
crosses a boundary between two transparent substances, it bends away from a line perpendicular to the boundary. As the angle of light hitting the boundary becomes sharper, the light bends farther and farther. Finally, it reaches an angle where the light is reflected back inside the material it is traveling through.
In other words, the light is completely reflected inside the substance, and not refracted. The reflection is the total internal reflection, or TIR.
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