In Young's double slit experiment how many maximas can be obtained on a screen (including the central maximum) on both sides of the central fringe if λ=2000 Ao and d=7000 Ao

For maximum intensity on the screendsinθ=nλ⇒sinθ=nλd=n(2000)7000=n3.5Since maximum value of sinθ is 1So n=0,1,2,3 only. Thus only seven maximas can be obtained on both sides of the screen.