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F3 - Optical fibres

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1. Refraction Snell’s Law.........but as the angle of incidence increases, eventually: 2. ...you reach the critical angle: This is the same as saying the angle of…
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  • 1. Refraction Snell’s Law.........but as the angle of incidence increases, eventually:
  • 2. ...you reach the critical angle: This is the same as saying the angle of refraction is 90° ....but
  • 3. Refractive Index is the ratio of wave speeds in two mediums:So: From before:
  • 4. When light hits a surface at an angle of incidence bigger than the critical angle then: TOTAL INTERNAL REFLECTION None of the light is transmitted ALL the light is reflected This is the basis of Optical Fibres
  • 5. DispersionThis is when signals spread out as they travel alongthe fibre.This can cause problems with data
  • 6. 1.2.
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