| A | B |
|---|
| Audiovisual Aids | Teaching and learning materials that have sound and visual characteristics. |
| Hardware | Equipment that is used in an audiovisual presentation or program. |
| Software | Programs that are developed and presented through the use of particular hardware. |
| Projection | Process of causing an image to appear upon a screen. |
| Front projection | Permits both the projector and the viewers to be on the same side of the viewing screen. |
| Rear projection | Projection equipment and the viewers are on opposite sides of a screen through which the image is displayed. |
| Keystone effect | A distorted visual aid caused when a screen mounted flat against a wall projects a wider image at the top than at the bottom. |
| Overhead Slide | A transparent plastic, cellophane, or acetate sheet with a size up to 10 by 10 inches. |
| Opaque Projection | Reflecting light from the surface of the original visual to the screen. |
| Model | A recognizable imitation of the real object and is often made of plastic, wook or metal. |
