What is an overhead Projector?
An overhead projector typically consists of a large box containing a very bright lamp and a fan to cool it. On top of the box is a large fresnel lens that collimates the light. Above the box, typically on a long arm, is a mirror and lens that focusses and redirects the light forward instead of up.Use in education
* Teaching materials can be pre-printed on plastic sheets, then the educator can directly write using a non-permanent, washable color marking pen.
* This saves time, since the transparency can be pre-printed and used repeatedly, rather than having materials written manually before each class.
* The enlarging features of the projector allow the educator to write in a comfortable small script in a natural writing position rather than writing on an overly large chalkboard and having to constantly hold his arm out in midair to write on the blackboard.
* When the transparency sheet is full of written or drawn material, it can simply be replaced with a new, fresh sheet with more pre-printed material, again saving class time vs a blackboard that would need to be erased and teaching materials rewritten by the educator.
* Following the class period, the transparencies are easily restored to their original unused state by washing off with soap and water.
* To summarise the textbooks.
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