Mondo Knows Facts
Optical fibres trap light using total internal reflection
Light signals bounce inside glass cores without escaping through the outer boundary
When light inside a dense glass core hits the cladding boundary at an angle greater than the critical angle, it undergoes total internal reflection. The light wave cannot refract into the outer medium and instead reflects entirely back inside the core. This mechanism enables fibre optic cables to transport digital data across global oceans with minimal loss.
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Tags: physics, optics, fibre optics
Optical fibres trap light using total internal reflection: the short answers
- Where does this come from, and can I check it?
- Light signals bounce inside glass cores without escaping through the outer boundary. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
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