Im a bit stuck on this tutorial problem on Bravais Lattices. The question initially asks to sketch the 5 2D Bravais lattices which i have done but i have no idea how to proceed with the next part, The question states(adsbygoogle = window.adsbygoogle || []).push({});

" use the definition of the Bravais lattice to show that the third real space axis is normal to the plane"

I assume somewhere i have to use the cross-product but i dont know at what point or even how in this case.

For exampe for the c-a plane of the primitive monoclinc the only info i know is that the length c does not equal that of a and that they are not normal. How do i proceed?

Thanks

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# Homework Help: Bravais Lattices?

**Physics Forums | Science Articles, Homework Help, Discussion**