1. The problem statement, all variables and given/known data At a young's experiment arrangement, there is a 500nm light beam, a distance of 1m from the slits to the screen and a 0.25mm between the two slits In what way the interference pattern will change if an adhesive tape is being taped to one of the slits with a 1mm thickness and an index of 1.5 (diffraction can be left out of the calculation) 2. Relevant equations Xmax = nD[Lambda]/d 3. The attempt at a solution The problem is presented in a general way, I can't find out what is the point of the adhesive tape addition to the problem. Can anyone please give a clarification and a possible direction?