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OPTICAL FIBRES:allow keyhole surgery(surgery without large incisions)

REFRACTION: the speed of light changes with the density of the material it enters!This change in speed may cause a change in direction..this is known as refraction.

LIGHT IS REFLECTED AT THE BOUNDARY BETWEEN THE MATERIAL AND THE AIR..THIS IS KNOWN AS TOTAL INTERNAL REFLECTION.

(http://hsc.csu.edu.au/senior_science/core/info_systems/9_4_6/Laserpath.gif)

TOTAL INTERNAL REFLECTION ALLOWS THE LIGHT TO TRAVEL ROUND

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