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ONOFRIO ROSARIO BATTAGLIA

A Low-Cost Smartphone Polarimeter and Malus’s Law

  • Autori: Gallitto, Aurelio Agliolo; Sancataldo, Giuseppe; Battaglia, Onofrio Rosario; Fazio, Claudio
  • Anno di pubblicazione: 2024
  • Tipologia: Articolo in rivista
  • OA Link: http://hdl.handle.net/10447/661873

Abstract

The use of smartphones in the introductory physics laboratory has recently received attention since it provides the possibility to perform a variety of didactic experiments. Smartphones equipped with several built-in sensors, controlled by appropriate software, allow students to explore physical phenomena and carry out various measurements of physical quantities. In this article, after a brief historical introduction about the discovery of light polarization and the development of the polariscope/polarimeter, we describe a low-cost and easily constructed smartphone polarimeter that provides a quantitative way of experimenting with light polarization. In particular, we discuss a didactic activity concerning the use of the smartphone ambient-light sensor to measure the intensity of light coming through two properly oriented polarizing filters, which follows the well-known Malus’s law.