No, Chapter 10 (Wave Optics) in the NCERT Exemplar for Class 12 Physics is not tough for most of the students. Rather, it is admitted to be one of the most interesting and the easiest chapters by most of the former students. Also, from NCERT's point of view, this chapter holds a great amount of importance in the Class 12 annual examination for Physics. Although some students who might not be interested in this topic can find this a bit tough, they can easily understand it by learning from the NCERT example for Class 12 Physics provided by Vedantu.