A thin, flexible strand of glass or plastic that carries information as pulses of light along its length, working on the principle of total internal reflection.
Optical fibres, their reliance on total internal reflection, their advantages over copper, and projects such as BharatNet are recurring information-technology and physics facts, with a secure-communications angle.
Optical fibre carries light, not electricity, which is why it is immune to electromagnetic interference; it is not simply a thin copper wire. It works by total internal reflection within the fibre, not by ordinary reflection from an outside mirror.
Glass or plastic strands that guide light by total internal reflection to carry high-speed data with low loss; the backbone of the internet and the BharatNet rollout.
concept total internal reflection, concept lasers, concept electromagnetic spectrum