Lesson: Chapter 5 — Optics

5.3.2. Total internal reflection and the critical angle 4 of 5 Reset answers

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Question 4

How does light travel along an optical fibre?

A In a perfectly straight line B By refracting out and back in C By being absorbed and re-emitted D By total internal reflection, again and again

The right answer is the one marked above.

By total internal reflection, again and again. That is why the light still comes out bright, even kilometres away and around bends.

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