Hi, can anybody help me with the following question, since I can't get 'X-ray crystallography for biologists' (or somilar..) by David Blow until after my work is due in, and all the other books are just way too indepth. The question: Briefly discuss the relationship between wavelength of radiation used, unit cell dimensions, crystal to film distance and separation of spots on the diffraction image. I've tried an X-ray crystallography specific forum but it seems rather dead, so perhaps there are some budding X-ray crystallographers here, or people who have covered the unit on their course... maybe a long shot. It's odd, the 'hard' part of the practical was fine for me, applying the equations and so forth but don't wanna lose easy marks here.. Cheers!