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UPSC 1995: 111. Optical fibre works on the principle of
(a)total internal reflection
(b)refraction
(c)scattering
(d)interference
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Not attemptedCorrect Answer: (a) total internal reflection
Light signals remain confined inside an optical fibre because they strike the core–cladding boundary at angles greater than the critical angle, undergoing total internal reflection repeatedly along the length of the fibre. Therefore the governing principle is total internal reflection; refraction, scattering or interference are not the primary mechanisms. ([examrobot.com](https://examrobot.com/content/optical-fibre-works-principle?utm_source=openai))
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What is the correct answer to this UPSC 1995 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 1995, GS Paper 1, as Question 111. 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.