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  4. In a Young's double slit experiment, fringe width equal to 1 mm is observed. Then the distance of the nearest bright fringe from the central fringe will be :-

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Q. In a Young's double slit experiment, fringe width equal to 1 mm is observed. Then the distance of the nearest bright fringe from the central fringe will be :-

NTA AbhyasNTA Abhyas 2022

Solution:

Given, $\beta =1mm=\left(D \lambda / d\right)$ Distance of 1 st bright fringe from the centre
$x_{n}=2n\left(\frac{D \lambda }{2 d}\right)$
For first bright fringe,
So $x_{1}=\left(\frac{D \lambda }{d}\right)=\frac{D \lambda }{d}=1mm$