A doubleslit interference pattern is producedon a screen , as shown in the figure , usingmonochromaticlight of wavelength500nm , Point P is the locationof the central bright fringe , that is produced when light waves arrives in phase withoutany path difference .A choice of the three stripsA,B and C of transparent materialswith different thickness and refractive indicates is available , as shown in the table . these are palcedoverone or both of the slits , singularityor in conjunction, causingthe interfernece pattern to be shiftedacross the screen from the origina pattern ,In the Column -I , how the stripshave been placed, is mentionedwhereas in the Clumn - II , order of the fringe at point P on the secreenthat will be produced due tothe placementof the strip (s) is shown. Correctly match both the column . {:("Film",A,B,C),("Thickness in" mu,5,1.5,0.25),("Refractive Index",1.5,2.5,2):}