Correct Answer - Option 4 : Epidiascope
Teaching Aids are devices by which the teacher helps the students to clarify, establish, and correlate accurate concepts, inspections, and appreciation through the utilization of more than one sensory channel. It means all the materials used to facilitate the understanding of written or spoken words. They are of the following types:
Audio: Radio, tape recorder, etc
- Visual: Chart, model, Diagram, etc
- Audiovisual: A video clip, computer, TV, etc.
Non-projected teaching aids are those aids which are used without any projection.
Project aids refer to the aids which are used to introduce concepts by projecting them on a screen. These are the types of audio-visual aids that maximize learning with the help of both auditory and visual systems.
Epidiascope: A projector used to display the reflection of both opaque and transparent objects on the screen by shining bulbs on the objects.
Hence, we conclude that Epidiascope is a projected aid used by a teacher in the teaching-learning process.