the results are correct however you have not used common sense, if you have those angles how can we see things? basically light is behaving like particles, thus you would not have shadows, however that only is true if you think in macroviews not micro views
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plus you do not need slits to get diffraction
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Obviously, in the reality objects are full of grates, so light can basically diffract and creep easily, you are not considering DSI intakes are not really smooth,
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the microworld has plenty of diffraction Ronny, the aircraft look smooth in the macro world, but for light they are not for that reason you can use short wavelength for radar
plus you have to consider power density
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Once you use that you can see why spot lights let us see and why radars can detect aircraft
