In the following arrangement y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photo current will be
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A
As we know in Young's double slit experiment fringe width = separation between two consecutive fringe or dark fringes
Here 
Energy of light incident on photo plate
According to Einstein photoelectric equation,
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