Question:
Which of the following works on the system of indirect projection?
Which of the following works on the system of indirect projection?
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Optical Projection Systems:
Direct $\rightarrow$ Slide Filmstrip projector.
Indirect $\rightarrow$ Overhead Projector (OHP with $90^\circ$ mirror).
Opaque Reflected $\rightarrow$ Epidiascope.
Direct $\rightarrow$ Slide Filmstrip projector.
Indirect $\rightarrow$ Overhead Projector (OHP with $90^\circ$ mirror).
Opaque Reflected $\rightarrow$ Epidiascope.
Updated On: Sep 4, 2026
- Slide projector
- Overhead projector
- Film projector
- Epidiascope
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Audio-visual projected instructional technology classifies optical projection systems into direct, indirect, and reflected types.
Step 2: Detailed Explanation:
Projection systems optical classification:
1. Direct Projection: Light passes straight through a transparent slide/film to the projection lens and screen (Slide Projector, Filmstrip Projector).
2. Indirect Projection: Light passes vertically through a horizontal transparent stage and is deflected by a $90^\circ$ mirror/prism in the projector head onto a vertical screen, as seen in the Overhead Projector (OHP).
3. Reflected Opaque Projection: Light is reflected off an opaque printed surface into a mirror and lens (Epidiascope Opaque Projector).
Step 3: Final Answer:
Therefore, Overhead projector works on the system of indirect projection, matching option (B).
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