Multiple choice

Which of the following is used in endoscopy?

  1. Optical fibres

  2. Glass fibres

  3. Glass wool

  4. None of these
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A Correct answer
Explanation

Optical fibers use total internal reflection to transmit light through flexible glass or plastic strands. In endoscopy, bundles of optical fibers carry light into the body and transmit images back, allowing doctors to see internal organs without invasive surgery. 'Glass fibers' is vague - optical fibers are specifically engineered for light transmission.

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