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Reflection of light

  1. Mar 10, 2010 #1
    1. The problem statement, all variables and given/known data
    A ray of light enters a light fibre so that it hits the side at an angle of 16° with the long axis of the fiber, . Calculate the distance the light ray travels between successive reflections off the side of the fibre. Assume that the fibre is 1.03x10-4 m in diameter.


    2. Relevant equations

    I don't really know where to start I think you need to use n=1.00 for air but i'm not really sure

    3. The attempt at a solution
    Again, I'm not sure what to do.. Should we use snell's law? Not sure how to relate this back to the distance the light travels.. or should it be the mirror equation? 1/f=1/p+1/q
     
  2. jcsd
  3. Mar 10, 2010 #2

    ideasrule

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    Homework Helper

    Draw out the path of the light ray. You don't need to use any optics equations; simple trigonometry would do.
     
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