Thought experiments and collaborative learning in physics

Thought experiments are tools often used by physicists. Learning authentic physics then also means that students need to develop a familiarity with the reasoning processes of thought experiments. This study examines the nature of learning processes that involve communication about image-based micro-worlds in optics. Thr results of this study show that students' investigations often have the structure of thought experiments. Thought experiments that use computer-based microworlds are powerful because they capitalize on the human capability for imager? that allow learners to 'see' the physical processes and construct qualitative understandings. In this study, the structure of students' activities as thought experiments arose from their collective efforts which started with the construction of an optics simulation. In the course of the activities, students' understanding evolved from fragmented views of optical situations to system views that included multiple components. Collaborative thought experiments are therefore emergent phenomena, triggered by the events as a whole rather than bring pre-designed. In the: course of the activities, students a ho participated in collective problem solving gradually adopted shared graphical representations and meanings.