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Third bright fringe: λ = 500 nm, D = 2 m, d = 1 mm. Distance from centre?
A1.0 mm
B1.5 mm
C6.0 mm
D3.0 mm
Answer & Solution
Correct answer: D. 3.0 mm
x = nλD/d = 3 × 500×10⁻⁹ × 2 / 10⁻³ = 3.0×10⁻³ m.
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