Total internal reflection occurs when:
1. A ray of light is incident upon a boundary with an optically rarer medium (one that makes it speed up)
2. The angle of incidence is greater than the critical angle.
The uses and application of Total Internal Reflection :
1. Telecommunications ; Optical fibres
2. Prismatic Optical Instruments
3. Bicycle Reflector
4. Finger printing devices
5. Rain sensors
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