what is optical fibre, explain the transmission of light which phenomenon is used here
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An optical fiber is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair.
Total internal reflection is the total reflection of a wave incident at a sufficiently oblique angle on the interface between two media, of which the second medium is transparent to such waves but has a higher wave velocity than the first medium.
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