The intensity in a Fraunhofer diffraction pattern for a single slit is given by the equation , where , is the wavelength of light, is the distance of the diffracting slit from the screen, is the width of the diffracting slit, and is the range of the diffracting pattern on the screen from the center of the space between the edges of the geometrical shadow. The intensity of the pattern is given in arbitrary units.
 K. Das, “Study of Fresnel and Fraunhofer Diffraction at a Single Slit through Computational Methods Using Mathematica,” National Competition for Innovations in Computational Physics (NCIP), 28th Annual Convention of Indian Association of Physics Teachers (IAPT), Kolkata, India, 26–28 October, 2013.
 A. Ghatak, Optics, 5th ed., New Delhi: Tata McGraw Hill Education Private, 2012.
 J. Valasek, Introduction to Theoretical and Experimental Optics, New York: Wiley, 1949.