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I The dielectric constant of water is 80, but refractive index

  1. Mar 31, 2017 #1
    The dielectric constant of water is 80, however its refractive index is 1 ·33 invalidating
    the expression n*n=ε. why?
  2. jcsd
  3. Mar 31, 2017 #2


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    Science Advisor

    Dielectric constant and n are frequency dependent. Are you sure you got values at the same frequency?
  4. Apr 6, 2017 #3
    Actually it is a exam question with 4 options, given below-
    (1) the water molecule has no permanent dipole moment
    (2) the boiling point of water is 100 °C
    (3) the two quantities arc measured by different experiments
    (4) water is transparent to visible light

    It seems that option (3) is correct .
    what do you think?
  5. Apr 6, 2017 #4


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    Staff: Mentor

    This will have to be posted in a homework forum, with the template properly filled out.

    Thread closed.
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