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Homework Help: Error estimation

  1. Oct 9, 2009 #1
    1. The problem statement, all variables and given/known data
    i did a lab on determination of refractive index of an opaque dielectric material, using the brewster angle. We took a couple of readings on a spectrometer at the position of complete extinction,
    now how do i get the error estimate ? The angles were taken to the nearest minute

    2. Relevant equations

    [tex] tan \theta_B = \frac {n_t}{n_i} [/tex]

    3. The attempt at a solution
  2. jcsd
  3. Oct 11, 2009 #2


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    Homework Helper

    you could look at dreivatives

    you have the refractive index calculated in terms of the angle
    [tex] n = f(\theta) [/tex]

    for a small change in angle
    [tex] d \theta [/tex]

    what is the corresponding change in refractive index?
    [tex] dn = \frac{df(\theta)}{d\theta}d\theta [/tex]
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