Drawing the Light Paths at a Lens to Find Its Effective Focal Length and Principal Planes

Autor/inn/en	Ma, Shih-Hsin; Wu, Jun-Yi; Chiang, Chun-Ming
Titel	Drawing the Light Paths at a Lens to Find Its Effective Focal Length and Principal Planes
Quelle	In: Physics Teacher, 60 (2022) 7, S.591-593 (3 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0031-921X
Schlagwörter	Science Instruction; Science Experiments; Light; Photography; Scientific Concepts; Measurement Techniques; Geometric Concepts; Optics; Physics + Suchen Sie Ihr Suchwort? Teaching of science; Science education; Natural sciences Lessons; Naturwissenschaftlicher Unterricht; Licht; Fotografie; Messtechnik; Elementare Geometrie; Optik; Physik
Abstract	This paper proposes a simple method to design experiments for drawing the light paths at a lens to find its effective focal length and principal planes. In the designed experiments, long-exposure photography was used to record the light scattered using a moving sheet of paper, thus revealing the light path. According to the proposed experimental method, (1) the effective focal length of a lens and (2) the principal planes of a lens can be measured. Moreover, the system is easy to build, inexpensive, and can promote students' understanding of geometric optics by providing an intuitive physical phenomenon. The work is also of pedagogic interest as it reveals a new simple experimental method to find the principal planes of a thick lens and its effective focal length. (As Provided).
Anmerkungen	American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail: pubs@aapt.org; Web site: http://aapt.scitation.org/journal/pte
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01