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Does the refractive index law change according to the medium

  1. Mar 11, 2015 #1
    The refrative index law should be sine(i)/sine(r) but in the answer he done the opposite. I included the answer in the bottom of the question.
     

    Attached Files:

  2. jcsd
  3. Mar 11, 2015 #2

    mfb

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    It just depends on what you call i and r and which angle you know.

    You can also write it as ##\sin(\alpha) n_\alpha = \sin(\beta) n_\beta## where nα means the refractive index of the medium where you have the angle α and similar for β. Usually, one medium is air with n=1.
     
  4. Mar 11, 2015 #3
    In the question provided, the i angle is the one from the lamp in the water and the r is the one in the air.

    What do you think about the answer I attached? Why is the r angle is the one in the water?!
     
  5. Mar 11, 2015 #4

    mfb

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    As I said, it does not matter how you call them, you just have to be consistent. n refers to the water, so the sine in the denominator on the other side should use the angle in the water here.
     
  6. Mar 11, 2015 #5
    Ok. Thank you very much.
     
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