Two slits S₁ and S₂ separated by d, screen at distance D. Fringe width β = λD/d. Position of nth bright fringe: y_n = nλD/d. Position of nth dark fringe: y_n = (2n-1)λD/2d. Angular fringe width = λ/d. Fringe pattern: alternating bright and dark bands of equal width.
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