that is the condition for interference maxima; obviously, for interference minima that will be d sin Ɵ it will 2 n plus 1 lambda by 2 here important is diffraction minima a sin Ɵ equal to m lambda and interference maxima d sin Ɵ equal to n lambda; that is m lambda here n lambda. position of maxima minima, if you consider we can get the see concept of missing order.
இங்கு d sin Ɵ =n λ என்பது குறுக்கீட்டு விளைவு மேக்ஸிமம் . .