A device that projects an enlarged image of a transparency placed on it onto a wall or screen by means of an overhead mirror.
- For many years, overhead projectors lit up transparencies, and slide projectors showed high-resolution 35 mm slides.
- Some of the best ideas were then enlarged, transferred onto the wall with an overhead projector and painted in acrylic paint.
- First, the student uses an overhead projector to project his or her image onto a large piece of stiff paper.
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