When monochromatic light passes through a narrow slit it produces on a screen a diffraction pattern consisting of bright and dark fringes. The intensity of the bright fringes. I, as a function of 9 can be calculated by
I = Imax(sina)2/a, = where a = πa/λ sin. θ
where A is the light wave length and a is the width of the slit Plot the relative intensity I/Imas as a function of θ for -20°

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Incidentn light