The scattering of plane electromagnetic waves of wave numberkby an infinite slit of width2aformed by two perfectly conducting coplanar screens of zero thickness is considered. In the limit of largekaand at grazing incidence, the asymptotic series for the transmission cross section per unit length of the slit is evaluated up to the order(ka)-11 i 2.
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Seshadri et al. (1960) studied this question.
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