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Homework Help: Angle between planes in orthorhombic crystal

  1. Sep 20, 2012 #1
    1. The problem statement, all variables and given/known data
    In an orthorhombic crystal the angle between (1 1 0) and (1 -1 0) is 38o and the angle between (001) and (201) is 65o. What is the angle between (211) and (2 -1 1) ?

    2. Relevant equations

    equation of direction cosines

    3. The attempt at a solution

    I found the b/a ratio by replacing unknown variable b in (110) and (1-10) and known cosine value of 38 degrees. I tried to use similar approach to solve for c/a with the other two planes (001) and (201) but I am not sure how to continue
  2. jcsd
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