Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Bidyut sinha
step :-1 :-First see the three slits...From the three slits, Electric Field are given by E1+E2+E3..Step:-02:- Electric Field is actually here Amplitude (Because to find intensity ,we know if we square the amplitude, then we will get Intensity)....Step :-03..From E1, let amplitude be A, from the second slit, you will get a phase change there(phase change of delta)..So E2=A exp(idelta)... Second slit,there is an again a phase change...2delta...So Electric Field Amplitude will be B exp(2i delta)....Step :-04...Now Generally we know that Intensity =(Amplitude)^2...Now here exp(idelta) terms are there...they are complex terms...So for squaring any complex number, we always do multiplication of that number × his conjugate...such as z^2=z z*... similarly here I =EE*=[(A+A exp(idelta)+Bexp(i2dela)][A+A exp(-idelta)+Bexp(-i2delta).. After that put the formula of Delta, for obtaining Sin theta in Delta expression, we know that sin theta=perpendicular/hypotenuse.. after that just calculation ...hope u will get the concept