Discussion
Which of the following does not belong to a projected aid ?
Answer: B
The overhead projector, the epidiascope and the slide projector are projected aids, since each throws an enlarged image on a screen by means of light. The blackboard is not projected: it is a non-projected visual aid on which the teacher writes by hand. So the blackboard is the one that does not belong. The answer is the blackboard. Other aids of the same kind are the film projector and the LCD projector, which also depend on light and a screen, whereas charts, models and the blackboard are displayed without projection.
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