![]() ![]() Low cost and the ability to send light signals through them with very little loss of light, make then indispensable in modern communication networks. Since light enters almost parallel to the fibre, the angle of incidence is high and it easily exceeds the critical angle that triggers off the total internal reflection. The trick is done by keeping the outer layer known as cladding less dense relative to the inner dense core - the first condition for total internal reflection. Little loss of its energy, thanks to total internal reflection. This humble device - a thin flexible glassįibre with a coating - carries light through a distance of miles and miles, with a very
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