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B6. Design one refractive (a) and one reflective (b) blazed diffraction gratings, optimized for first order diffraction and application at wavelength λ = 500 nm. Assume that the period of grating must be 3000 nm due to fabrication limitation. Briefly explain the principle of your design and sketch the design with indication of all important distances using the following materials: (i) Transparent materials of index n = 1.60 High reflectivity coating materials