Total internal reflection optical fibre

Fibre optic
Total internal reflection oocurs

1. Total internal reflection Optical fibre

2. Optical fibres are just 'reflective tubes'. If you shine light down the tube, and it keeps going because it bounces from the walls.

3. They do this by Total Internal Reflection. That's why optical fibers can guide light for such long distances - because the walls of the fibre don't absorb any light at all as long as the angle of incidence is greater than the critical angle. Total Internal Reflection causes 100% reflection. In no other situation in nature does this occur, so it is unique and very useful as it is 100% efficient at transfering the light energy.

4. - The refractive index of the first medium is greater than the refractive index of the second medium (n1>n2) - The angle of incidence must be greater than the critical angle ( i >c) There are two conditions necessary for Total Internal Reflection to occur:

5. Uses of optical fibre Optical fibres are used in endoscopes that allow surgeons to see inside their patients. Optical fibres can also carry enormous amounts of information as pulses of light

6. Made by : Elaine song Sources: http :// www.cyberphysics.co.uk/topics/light/FiberOptics/FibreOptics.htm http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/wave_model/lightandsoundrev4.shtml Thank you