Anti-Reflective coatings

Righeira

hi I am new to this forum. this question might be simple. but i am confused a lot..i am a project student working on AR multilayer coatings.... coatings are done by dip coater... my doubt is that there are coatings on either side...how does the light pass through one side and come along the other when their refractive index is reverse on the other side of the coating... one side it is n of air,coating1,coating2 glass as the substrate...but on the other side it is reverse...where can i find the details...i find very difficult to understand this...i understood the concept of interferences why that particular thickness is selected and all that....please help me...where can i clarify the doubts for this