At P1,Δx=0 P2,Δx=d=3000λ so,between P1 and P2 2999 bright fringes will be formed. So, A is correct At P2, there will be bright fringe. So, B is incorrect At P2 there will be 3000th bright fringe At angle θ, Δx=dsinθ (assuming the circle to be of large radius) Rate of change of path difference is
d
dθ
(Δx)=dcosθ Which decreases with increasing θ. so for small values of θ, path difference increases sharply with increases in θ resulting in closer fringes. So, angular separation between consecutive bright sports increases as we move from 1 2 P P to . So, D is incorrect