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Student recognition of interference and diffraction patterns: An eye-tracking study

Ana Susac1,*, Maja Planinic2, Andreja Bubic3, Lana Ivanjek4, and Marijan Palmovic5

  • 1Department of Applied Physics, Faculty of Electrical Engineering and Computing, University of Zagreb, Unska 3, 10000 Zagreb, Croatia
  • 2Department of Physics, Faculty of Science, University of Zagreb, Bijenicka 32, 10000 Zagreb, Croatia
  • 3Chair for Psychology, Faculty of Humanities and Social Sciences, University of Split, Sinjska 2, 21000 Split, Croatia
  • 4Faculty of Physics, University of Vienna, Porzellangasse 4, 1090 Vienna, Austria
  • 5Laboratory for Psycholinguistic Research, Department of Speech and Language Pathology, University of Zagreb, Borongajska cesta 83h, 10000 Zagreb, Croatia

  • *Corresponding author. ana.susac@fer.hr

Phys. Rev. Phys. Educ. Res. 16, 020133 – Published 11 November, 2020

DOI: https://doi.org/10.1103/PhysRevPhysEducRes.16.020133

Abstract

Previous studies have demonstrated that students have difficulties in applying the wave model of light to explain single-slit diffraction and double-slit interference patterns. In this study, we investigated if students could recognize typical interference and diffraction patterns at all. Eye movements of high-school students were measured while they were identifying patterns produced by monochromatic light on a double slit, single slit, and diffraction grating, and by white light on a diffraction grating. Most students had difficulties with recognizing double-slit interference pattern and diffraction grating pattern of monochromatic light. Identification of the single-slit diffraction pattern was easier probably due to its distinguishable central maximum. The easiest task for students was recognizing the diffraction pattern of white light on an optical grating. Eye-tracking data suggested that even students who incorrectly answered this question were aware that the diffraction grating separates white light into colors. Additionally, eye tracking revealed that students who identified patterns correctly attended more the correct pattern than other options, thus corroborating previous findings. Overall, the results indicate that the recognition of interference and diffraction patterns is quite demanding for students, suggesting that more attention should be paid to observing and understanding basic wave optics phenomena.

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