This video lecture from Physical Optics (F.Sc. first year physics) covers Diffraction of X-rays by crystals, its experimental demonstration, Bragg’s equation and its applications. Also you will know that how the concept of Braggs law is used in determining the structure of biological molecules. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.