Arrey, that formula in the books says it should be about 0.6 mm, yaar, with your numbers. But in my shed, with a cheap laser pointer and two scratches on a blackened glass slide? I got messy blurs, not clean lines. The fringe width theory is perfect, but my hands and this dusty air are not. It reminds me of the perfect apple size the agriculture pamphlet promises, which my trees never quite achieve.
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