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Optical fiber communication works on the principle of transmitting information in the form of light pulses through a thin strand of glass or plastic called an optical fiber. The fiber consists of a central core surrounded by a cladding layer with a lower refractive index. When light is launched into the core at a suitable angle, it undergoes total internal reflection at the core–cladding interface. This ______ _____ ____ ______ __________ ______ _______ _______ _______.
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