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Homework Help: Quick Miller Index Lattice Problem

  1. Feb 11, 2009 #1
    1. The problem statement, all variables and given/known data
    Indicate the (111) and ([11]0) ([11] has an over line, so is negative, dont know how to do on forums!) planes in a cubic lattice in a diagram, then calculate the angle between them.


    3. The attempt at a solution
    I think I have drawn this right (see attatchment), but Im not sure what angle it is refering to.

    I would guess it is 90 degrees (in red), but I doubt I would be asked this, maybe the other angle (purple), could someone give any thoughts?

    Also if my drawing is wrong, let me know! I wasn't 100% sure about the negative (110)
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Feb 12, 2009 #2
    Take the angle between the normals to the planes. It will eliminate ambiguity and it will be much easier. You should know what vector is normal to the plan (h k l) if you studied reciprocal lattice.
     
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