Wave optics --u can unerstand it if u see it deeply and clear ur concept..
if u goin self study ,then u should read the chapter again and again
if u fil hard then follow different books 2 understand..in market there are many books with name simplified physics,,i suggest u 2 take the SLAroras one thats good to understand......and ofcourse u ve JEE preparation books
after studyng try to solve some questions objective,,so that u can get some idea of applications....
and the rest is in u how u take it..
plzz dnt 4rgt 2 approve my answer if u like itt ==