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Explain the value of refractive index of water?

  1. Jan 30, 2016 #1
    I have studied about the formula of refractive index which is: dbff99e30f01687f56047d647d3186d6.png . That means in the case of water which have μ =1 (approximate) and ε = 81, then n should be 9. But why we often use the value n = 1.33 for water ???
    Who can explain for me? I don't think the above formula is wrong, of course!
  2. jcsd
  3. Jan 30, 2016 #2


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    You have taken a value for the relative permittivity which is not valid for visible wavelengths. The permittivity (and hence refractive index) changes with the frequency.
  4. Jan 30, 2016 #3
    yeah, I got it! Thank you so much^^
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