By entering into IT age, new methods of teaching are envisaged great mutation. Proportion to these developments it is necessary to change methods of teaching. In this case teachers' experience is insufficient and therefore they don't tend to apply new and activate methods of teaching and sometimes they blackball these methods. Considering personal diversities of students' viewpoint and requirements in different phenomena and also their substantial and proficiency will signify the necessity of versatility and diversity in methods of teaching in physics. And the mentioned diversity depends on teacher's creativity and innovation. In these methods skilful activity and capacity of students is efficiently used in the instruction process. Applying these abilities in activities of small groups make process of learning lovable and full of fun. In this way, personal capacity and ability of students can be used in order to help didactic process by themselves so that they understand that instruction is not a unilateral process from teacher and book toward them, but their applied capacities and abilities in small groups is the best way for instruction from students toward themselves. If students discover that how much their mental information and handy skills is helpful and pleasurable for them, then they will be instigated to work in group activities. In this article according to attractiveness of "optical phenomena" for students and considering physical condition and required instruments of public classrooms in developing countries like Iran, this topic of physics is chosen.