5. Derive an expression for the Fraunhofer diffraction pattern (Four transform) for an aperture made of M =2L+1 parallel slits of infinitesimal widths separated by equal distances a= 10A, p(x, y) = L8(x-ma) m=-L Sketch the pattern as a function of the observation angle 0 = x/d, where is the d is the observation distance.

5. Derive an expression for the Fraunhofer diffraction pattern (Four transform) for an aperture made of M =2L+1 parallel slits of infinitesimal widths separated by equal distances a= 10A, p(x, y) = L8(x-ma) m=-L Sketch the pattern as a function of the observation angle 0 = x/d, where is the d is the observation distance.