In the double-slit experiment, the distance of the first dark fringe from the central line is 1mm. The distance of the 2nd bright fringe from the central line is
A
6mm
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B
4mm
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C
12mm
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D
16mm
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Solution
The correct option is B 4mm BrightbandDarkbandXn=nλDdXn=(2n−1)λD2d nB=2 nD=1 X2BX1D=nB×2(2nD−1)=2×22−1 X2B=4X1D =4×1mm =4mm