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The optical fibers work on the principle of total internal reflection.the optical fibers are mainly used in telecommunication.it is helpful for send information in the optical fibers. it look likes a small hair.
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tejsurya please
Optical fiber work on the principle of TIR(total internal refraction).TIR means ,when light travel from denser medium to rarer medium the angle of incidence is greater than critical angle the incident ray will bounce back instead of refraction 
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