Consider the points A, B, C, D where coordinates are respectively(1,-1, 0), (0, -1, 1), (0, 1, -1) (0, 1, 1) Find the direction cosines of AC and BD and calculate the angle between them p 12:27

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Crystalline Imperfections

The crystalline imperfections are described as the geometrical defects in the crystal due to incorrect arrangement of atoms, impurity, vacancy, and many more. It is not possible to achieve a perfect or ideal crystal, practically.