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Waves

Light - Total Internal Reflection - Optical Fibres - Endoscope.

An endoscope is an instrument used by Doctors and Surgeons.

A bundle of very thin optical fibres is used with lenses
to see inside a body.
Only a small hole in the skin is necessary to insert the endoscope.
Some of the optical fibres take light down to the end of the endoscope
which shines inside the body.
Other optical fibres in the bundle collect the reflected light using lenses.
The reflected light is sent along the fibres to a computer
which displays the information as a picture on a monitor.
It is sometimes possible to perform medical operations inside people
by using an endoscope, rather than making a large cut in the skin.

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