In which of the following projectors, the loss of light is maximum?
Show Hint
Opaque Projector: Lowest efficiency, highest light loss.
OHP: Better efficiency.
Slide/Film Projectors: Highest efficiency.
This is why opaque projectors are rarely used today.
- Opaque projector
- Slide projector
- Film projector
- Overhead projector
The Correct Option is A
Solution and Explanation
This question tests knowledge of different types of projectors and their efficiency in light transmission.
Step 2: Analyzing Projector Types:
Let's analyze each type:
• Opaque Projector (Episcope): This projector is used to project images from opaque objects (books, pictures, drawings).
_ _ _ _ Light Loss: Maximum.
_ _ _ _ Reason: The light must be reflected off the surface of the opaque object, and only a small portion of the light is reflected.
_ _ _ _ The reflected light is then captured and projected, resulting in significant light loss.
_ _ _ _ The image is also often dim and requires a completely dark room.
• Slide Projector: Projects images from transparent slides.
_ _ _ _ Light Loss: Moderate.
_ _ _ _ Reason: Light passes through the transparent slide with relatively little loss.
• Film Projector: Projects images from a film strip.
_ _ _ _ Light Loss: Moderate to low.
_ _ _ _ Reason: Light passes through the film, which has some transparency.
• Overhead Projector: Projects images from transparent sheets.
_ _ _ _ Light Loss: Low to moderate.
_ _ _ _ Reason: Light passes through the transparency, and the mirror reflects it with relatively little loss.
Step 3: Comparing Light Loss:
The opaque projector has the maximum light loss because it relies on reflecting light off an opaque surface.
The other projectors (slide, film, overhead) allow light to pass through a transparent medium, which is more efficient.
Step 4: Final Answer:
The loss of light is maximum in an opaque projector. Therefore, option (A) is correct.
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