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Where's that from?

Yash likes to know where equations come from and so do I which is why the appearance of this equation into the syllabus is a bit unsatisfactory. Questions require its use but not any understanding. Yash asked me if I could derive it, I replied "probably", some hours later and here it is. I thought I'd try a video approach, not sure if it worked but you can judge for yourself.

Tags: resolvance, diffraction

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