1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted