Abstract: This work focused on the study and analysis of the behavior of fringes formed by EM wave diffraction through small circular aperture of finite diameter on a cylindrical perfect conducting screen of a finite thickness, L. The nature of the fringes intensity formed on the perfect conducting screen was analyzed with reference to the three windows within EM spectrum such as ultraviolet, visible and infrared. The intensity of the fringes distribution was found to depend on the wavelength of the radiation associated to each window. The work also showed the different diffraction patterns that formed normal distribution pattern for different wavelengths within electromagnetic wave spectrum with a central fringes being more intense in each case than the others that appeared like background fringes. The graphs of the ratio of spectral energy to the conductivity of the screen plotted for the three windows considered in this work as a function of thickness of screen respectively.Abstract: This work focused on the study and analysis of the behavior of fringes formed by EM wave diffraction through small circular aperture of finite diameter on a cylindrical perfect conducting screen of a finite thickness, L. The nature of the fringes intensity formed on the perfect conducting screen was analyzed with reference to the three windows with...Show More