BRAINCAKEOptical Fibres
Optical fibres are made of a core of transparent material surrounded by a layer of cladding of a lower refractive index to reduce light loss from the core by total internal reflection.
Optical Fibres are used in endoscopes and in communications to carry signals.
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Key terms in this lesson
- Refractive index
- A measure of how much a substance slows down and bends light, equal to the ratio of the speed of light in a vacuum to the speed of light in the substance, or, at a boundary, sin i divided by sin r.
- Critical angle
- The angle of incidence, in the denser medium, above which total internal reflection occurs at a boundary.