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bknock

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Obviously, edge effects of the slit are becoming important for very thin slits. My question is this: is the prediction of Kirchhoff's diffraction formula correct (that is, are edge effects reflecting or absorbing extra energy to maintain energy conservation) or is the formula incorrect (that is, are edge effects affecting the screen's diffraction pattern)? Possibly the answer to this depends on the specifics of the slit. I am not an optics person, so I hope someone can help me! Basically, how much energy is expected to go through a very thin slit?