- optical fibre is device which is used to conduct a light along any curved path.it works on the principle of total internal reflection.
- construction:optical consists of large no of fibre (strand)of fine quality glass (quartz)whose RI is 1-7 \
- each fibre is coated with thin layer (oladding) of material (glass of plastic) of RI 1.5
- thus core of this fibre is optically denser than outer layer
- the fibre is very thin (diameter 10 raised -14)
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