The diffraction of scalar waves by a slit is examined by a method which uses orthogonal functions and Fourier transformations. In the case of perfectly soft screen an exact solution and the far field are obtained. Numerical results of the plane wave transmission coefficients for normal incidence are given for k =0.2∼16, where k is the wave number.
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Takurō Ôtsuki (1976) studied this question.
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