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Refraction




    Snell’s Law



.........but as the angle of incidence increases, eventually:
...you reach the critical angle:




 This is the same as saying the angle of refraction is 90°




                                                      ....but
Refractive Index is the ratio of wave speeds in two mediums:



So:




 From before:
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
Dispersion
This is when signals spread out as they travel along
the fibre.

This can cause problems with data
1.




2.
F3 - Optical fibres

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F3 - Optical fibres

  • 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.
  • 6.
  • 7. Dispersion This is when signals spread out as they travel along the fibre. This can cause problems with data
  • 8.
  • 9.
  • 10.
  • 11.
  • 12. 1. 2.