Two polarizers A and B are aligned so that their transmission axes are vertical and horizontal, respectively. A third polarizer is placed between these two with its axis aligned at angle θ with respect to the vertical. Part A)Assuming vertically polarized light of intensity I0 is incident upon polarizer A, find an expression for the light intensity I transmitted through this three-polarizer sequence. Express your answer in terms of the variables I0 and θ.I = ?Part B)Calculate the derivative dI/dθ.Express your answer in terms of the variables I0 and θ.