The imperative of today’s education in the field of physics and natural sciences is to overcome the conventional form of teaching which is mostly reduced to students’ repetition of the appropriate lessons. Having that in mind, we are more concentrated on involvement of students in the teaching process through stimulation of their individual way of thinking and the use of knowledge gained through their own experience. The paper describes in detail three geometric optics experiments that can be explained on the basis of knowledge about the linear propagation, reflection, refraction and total internal reflection of light. These experiments, although simple to perform, are of problem‐solving character because their results represent the paradox between the acquired knowledge and the already experienced one, thus attracting the students’ attention and making them more interested in the acquisition of knowledge.

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