Optical fibres transmits light between the two ends of the fibre. They are most often used in carrying signals as well as medical imaging.
What property (of light) is used in optical fibres?
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Total internal reflection occurs when a ray of light strikes the inner surface of a material and 100% of the light reflects back inside it. In this case, the refracted ray will not emerge from the medium, but will be reflected back into the medium. Thus no light is lost as it is reflected.
Try another light question: The refractive index !