The Opaque Projector: The Inverse of the Camera Obscura

• Autores: Thomas B. Greenslade Jr.
• Localización: The Physics Teacher, ISSN 0031-921X, Vol. 49, Nº. 4, 2011, pág. 241
• Idioma: inglés
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• Resumen

  • Many years ago I was running the standard laboratory experiment on thin lens optics. The source was the usual selfilluminated object mounted on an optical bench, and a converging lens formed a real image on a screen. One of the students sitting near one wall of the darkened lab was having some trouble with the idea of image formation. Her face was lit by the light from a shaded gooseneck lamp, and as she looked at me holding the lens in my hand, the inverted image of her face appeared on a nearby wall. And, the image was in color! Not only was this a classic teaching moment, but I realized that, by chance, we had set up an opaque projector.