There is no such simple argument to enable us to find the maxima of the diffraction pattern. The intensity profile can be calculated using the Fraunhofer diffraction equation as I ( θ θ ) = I 0 sinc 2 ⁡ ⁡ ( d π π λ λ sin ⁡ ⁡ θ θ ) , where I ( θ θ ) is the intensity at a given angle, I 0 is the intensity at the central maximum ( θ θ = 0 ), which is also a normalization factor of the intensity profile that can be determined by an integration from θ θ = − − π π 2 to θ θ = π π 2 and conservation of energy, and sinc ⁡ ⁡ x = sin ⁡ ⁡ x x , which is the unnormalized sinc function.