The bat signal
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Keith Zengel
[2]
;
Anna Klales
[1]
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[1] Harvard University
Harvard University
City of Cambridge, Estados Unidos
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[2] Wentworth Institute of Technology, Boston, MA
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- Localización: The Physics Teacher, ISSN 0031-921X, Vol. 62, Nº. 7, 2024, págs. 612-613
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Here is a simple experiment you can run remotely or in person with basic household items: making a bat signal. First, have your students cut out a bat shape from black construction paper, then have them hold the bat in front of a desk lamp aimed at the wall. This setup looks like what we see in the movies and comics, but it doesn’t work! Instead of a projected bat shadow surrounded by a circle of light, we only see a slightly dimmer light projected onto the wall. With a little Socratic prodding, you can get your students to explore the basic principles of geometric optics to make functioning pinhole, pinpoint, and thin-lens bat signals.
