Abstract
The paper examines ways of teaching wave pulses traveling on strings and wave fronts in two dimensional waves. The phenomena examined for pulses are: reflection, transmission and superposition. Two methods of finding the refracted wave fronts, the corresponding rays and the refraction angle are presented. Then the gradual change of the speed of propagation of a wave is presented. In the last part is examined the application of the concept of wave fronts in lenses and Huygens’ method of finding the shape of a perfect lens. The students’ difficulties with connection with all these subjects are presented.
Highlights
An introductory course of Physics has to deal with particle and wave notions
Later during the exams about 25% of the students are able to apply the notions of superposition to the reflection of pulses. d) Two dimensional pulses: reflection and refraction After examining the basic notions of periodical waves the students were introduced to two dimensional waves
The student has to turn a transparency with periodic wave fronts until they fit with wave fronts lying in another medium (Figure 13)
Summary
Mihas Pavlos1* & Gemousakakis Triantafyllos Department of Elementary Education, Democritus University of Thrace, Alexandroupolis, Gr-68100, Greece 2 Department of Medicine, Democritus University of Thrace, Alexandroupolis, Gr-68100, Greece * Mihas Pavlos, Department of Elementary Education, Democritus University of Thrace, Alexandroupolis, Gr-68100, Greece
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