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UPSC 1999: Endoscopy, a technique used to explore the stomach or other inner parts of the body is based on the phenomenon of
(a)total internal reflection
(b)interference
(c)diffraction
(d)polarisation
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Not attemptedCorrect Answer: (a) total internal reflection
Endoscopes contain bundles of optical fibres that guide light by repeated total internal reflection, allowing illumination and image transmission from inside the body; the other phenomena (interference, diffraction, polarisation) are not involved in fibre-optic light guidance. ([edukemy.com](https://edukemy.com/blog/upsc-prelims-topic-wise-questions-physics-optics/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 1999 Science & Technology question?▼
The correct answer is option (a): total internal reflection. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1999, GS Paper 1, as Question 119. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.