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dc.contributor.authorKreetha Kaewkhongen_US
dc.contributor.authorNarumon Emaraten_US
dc.contributor.authorKwan Arayathanitkulen_US
dc.contributor.authorAlex Mazzolinien_US
dc.contributor.otherMahidol Universityen_US
dc.contributor.otherSwinburne University of Technologyen_US
dc.identifier.citationPhysics Teacher. Vol.47, No.4 (2009), 243-245en_US
dc.description.abstractA point source of light sends out light rays in all directions and in straight lines. This is an important concept for all students who study elementary optics at the high school level. Most physics textbooks discuss this topic only briefly.1-6 They usually explain the concept by using two-dimensional diagrams even though a three-dimensional discussion may be more instructive. Much of the commercial demonstration equipment that can be used to explain this concept is very expensive (e.g., the optics kit from Suksapan Panit Company7 in Thailand costs approximately $70 U.S.). This and similar optics kits show that light propagates in straight lines but do not represent where the light beams come from. Because it is an abstract idea, most students still have considerable misunderstanding about this concept.8-F14 This paper describes an effective but inexpensive (approximately $20 U.S.) apparatus to illustrate the behavior of light rays emitted isotropically from a point source of light. The apparatus is simple and is intelligible to students.en_US
dc.rightsMahidol Universityen_US
dc.subjectPhysics and Astronomyen_US
dc.subjectSocial Sciencesen_US
dc.titleA simple apparatus for demonstrating how light rays emanate from a point sourceen_US
Appears in Collections:Scopus 2006-2010

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