In the master's thesis, I present the planning and implementation of an activity designed for grammar school students. The activity is aimed at acquiring and deepening knowledge about optics and refraction of light. The activity takes place in the form of a one-time live meeting with third-year grammar school students and
takes place in the form of group work. Based on the ISLE approach, students investigate the dispersion of white light passing through a glass prism. The beginning of the thesis covers the theoretical background of the investigated phenomenon, my
own investigation of the phenomenon and the implementation of an observational experiment with two classes of second-year grammar school students, which gives an insight into students' way of thinking. In the following, I describe the composition and execution of the activity, carried out with the third-year students. I describe the students' reactions and comments during the activity and the entire course of the meeting. Based on the findings, I perform an analysis of their work, in which I use self-assesment rubrics developed by researchers at Rutgers University to evaluate the data. In the conclusion, I identify and highlight the challenges students encounter during the activity and propose improvements that would enhance the activity and optimize the research processes within the groups.
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