FIBRE OPTICS
Fibre optics, also known as optical fibre, are a medium and technology used to transmit light along two ends of the fibre. They are widely used in fibre-optic communications where they allow transmission over long distances and at higher data rates (bandwidth) than electrical cables.
The medium of fibre optic is a hair-thin fibre that is often made of glass but sometimes of plastic. The light ray beamed into the fibre, through total internal reflection, can spread within the core to great distances without attenuation or reduction in intensity.