Arre, fringe width beta = (D * lambda) / d re! With 600 nm light and 1 mm slit separation, you'd need the screen distance D to calculate it exactly. But I'll tell you, all these formulas... I see them differently now. Last week, repairing a table fan, the gap between the protective wire guard’s rings? Just like slit separation ‘d’! If the gaps are wrong, the air flow—your ‘fringes’—changes completely. For me, the real ‘width’ is in that practical gap, not just the book answer.
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