Indirect Projection Type AV Aid
Which of the following is an example of indirect projection type audio-visual aid?
- Slide projector
- Overhead projector (OHP) — Correct Answer
- Filmstrip projector
- Opaque projector (Epidiascope)
Explanation:
Correct Answer: Overhead projector (OHP)
The Overhead Projector (OHP) is an example of the indirect projection type of visual aid. In indirect projection, light passes through a transparent medium (transparency/acetate sheet) and is reflected/redirected to project the image.
Classification of Projected Visual Aids
- Direct projection: Slide projector, Filmstrip projector — light passes directly through the medium.
- Indirect projection: Overhead Projector (OHP) — uses mirrors and lenses to redirect light.
- Reflected projection: Opaque projector (Epidiascope) — projects opaque (non-transparent) materials by reflecting light off the surface. Cannot project transparencies; used for books, charts, photographs.
Memory Tip
OHP = Over the Head = Indirect (the image goes up then bounces down to screen). Epidiascope = Reflected (bounces off opaque surfaces).
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This multiple choice question is from Animal Refresher, Veterinary Extension Education. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Refresher to strengthen your preparation.
