Light from a sodium lamp (λ = 590 nm) falls on YDSE with d = 0.5 mm, screen D = 1 m. Fringe width:
A11.8 mm
B1.18 mm
C118 mm
D0.59 mm
Answer & Solution
Correct answer: B. 1.18 mm
β = λD/d = (590 × 10⁻⁹)(1)/(5 × 10⁻⁴) = 1.18 × 10⁻³ m = 1.18 mm.
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