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Article
The Opaque Projector: The Inverse of the Camera Obscura
The Physics Teacher
  • Tom Greenslade, Kenyon College
Document Type
Article
Publication Date
1-1-2011
Disciplines
Abstract
Many years ago I was running the standard laboratory experiment on thin lens optics. The source was the usual self‐illuminated 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.
Citation Information
“The Opaque Projector: The Inverse of the Camera Obscura”, The Physics Teacher, 49, 241 (2011)