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Homework Help: Critical angle inside cable

  1. Feb 16, 2010 #1
    A fiber optic (n = 1.5) is submerged in water (n = 1.33). What is the critical angle for light to stay inside the cable?

    i am so confuzed. this is the final question of my paper and i am stuck on a couple questions before this so it is obvious i would get this. i just need a start please.
  2. jcsd
  3. Feb 16, 2010 #2


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    sinC = 1/n
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