One and Two Slit Intensity Profile Two slits are d - 7w apart, where w is the width of each slit. a) What are the angles of the first three bright spots (not including the center) of the substructure (due to two-slit interference)? Express your answer in terms of A and d. b) What are the intensities of light at the angles found in the previous part (considering both the envelope due to single slit diffraction and the substructure due to two-slit interference)? Express this in terms of Jo, the intensity at 0 = 0. c) Extra credit: Are any bright spots in the substructure shadowed by the envelope? If so, which ones (not necessarily found in part a) )