if we had to find first bright fringe from central maxima in YDSE then do we have to take n=2 or n-=1 similarily for first dark fringe from central maxima do we have to take n=1 or n=2 ( using 2n-1/2)
if we had to find first bright fringe from central maxima in YDSE then do we have to take n=2 or n-=1
similarily for first dark fringe from central maxima do we have to take n=1 or n=2 ( using 2n-1/2)