Light and Lenses
3 important questions on Light and Lenses
What is total internal reflection?
Where the angle of incidence is increased so that no further refraction can take place and all light in reflected back
What is the critical angle?
The angle at which total internal reflection occurs
How do optic fibres work?
The centre of the fibre is made of glass with a high refractive index. Because the fibre is thin, the light that enters has an angle of incidence bigger than the critical angle so that total internal reflection occurs.
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