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buffordboy23
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A simplifying assumption in determining the interference pattern from a double-slit experiment is to assume that the screen distance, D, is much larger than the slit separation, d. This allows us to make the approximation that the two optical rays are parallel as they travel to the common point, P, on the viewing screen. Does anyone know of any good websites, hopefully ones with pictures, that discuss the appearance of the interference pattern when D is about the same order of magnitude as d? If possible, I'd prefer a qualitative discussion rather than a quantitative one at this moment in time. Thanks.