 589 what is given is central break though separation between the state small days what 490.3 oh sorry this is 12 mm next question see try not much I mean what if you solve 60 70 problems also do not miss on that finish this chapter in next 2-3 days I mean what before coming next class and this part in half so you did the first experiment that is why the intensity is 2.2 gone sorry I know that I am gone so cos square 5 by 2 becomes 1 by 2 plus minus so plus minus means one point will be above for the sake of simplicity 5 by 2 is difference is 5 by 2 ok at location y what is the path difference d 10 theta it happens to be d 5 by d so this is a path difference at a distance y so what is the phase difference to this 2 pi so d 5 by d correspond to 2 pi by lambda d by capital D so this should be equal to that when you quit it what do you get 2 pi by lambda by d by d is equal to pi by 2 pi by 1 y is equal to d lambda by 4 d so at this location above and below you have intensity which is half of the maximum possible intensity ok so today we have covered almost 80% of way of this fine and almost 90% fine go back home today itself at least try 30 question your own 30 question will take one hour remember this have this thing in your head 30 question is equal into one hour of effort don't count your effort sitting on the desk count with number of question 30 question means one hour whether you do it in 5 hours 6 hours whether if you put phone in front of you 30 question will be done in 5 hours fine so I am asking you to spend one hour only and solve 30 questions ok and next day tomorrow you do not have a sentence so at least try 100 question then this chapter will be done for all you will never have to look back on this chapter