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Light of 600 nm falls on a 0.2 mm slit with a screen 1 m away. What is the width of the central bright fringe?
A3 mm
B6 mm
C1.5 mm
D12 mm
Answer & Solution
Correct answer: B. 6 mm
Central width = 2 lambda D / a = 2 x 600e-9 x 1 / 0.2e-3 = 6e-3 m = 6 mm.
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