University students’ ideas about the role of the aperture and laser beam dimensions in formation of diffraction patterns (CROSBI ID 268394)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Mešić, Vanes ; Vidak, Andrej ; Hasović, Elvedin ; Đekić, Maja
engleski
University students’ ideas about the role of the aperture and laser beam dimensions in formation of diffraction patterns
Successful application of the Huygens–Fresnel principle often requires reasoning about the interplay of aperture and light beam dimensions for purposes of identifying the unobstructed part of the light beam which is the source of secondary waves. Therefore we decided to identify university students’ ideas about the role of this interplay in the formation of diffraction patterns. We conducted a survey research with 191 first-year students from the Faculty of Chemical Engineering and Technology at the University of Zagreb, Croatia. They were administered six constructed-response questions in which aperture or laser beam dimensions were varied and students were expected to verbally and pictorially describe how these changes would affect the diffraction pattern. It has been shown that 63% of students think that a change in the length of the vertical slit necessarily results in a change of the diffraction pattern, even when the illuminated portion of the slit remains the same. In addition, it has been found that nearly 40% of students believe that in optical grating diffraction an increase of beam diameter leads to bigger diffraction fringes. A possible way to overcome some of these difficulties would be to insist on consistent application of the Huygens–Fresnel principle
wave optics ; Huygens–Fresnel principle ; misconceptions ; survey research
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Podaci o izdanju
40 (5)
2019.
055701
24
objavljeno
0143-0807
1361-6404
10.1088/1361-6404/ab25fc
Povezanost rada
Fizika, Interdisciplinarne prirodne znanosti