Laue equations a(cos w1-cos 1)=h a(cosΨ1-cosp1)=h b(cosΨ2-cosp2)=k2J c(cosΨ3-cosp3)=In Incident beam Sharp diffraction peaks can only be observed when all the three equations are satisfied simultaneously!Laue equations Sharp diffraction peaks can only be observed when all the three equations are satisfied simultaneously!