Exam-style question
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What is the role of total internal reflection in optical fibres?.
- A.To allow light to escape the fibre.
- B.To transmit light signals over long distances.
- C.To increase the speed of light.
- D.To change the wavelength of light.
Model answer
What a good answer should say
- To transmit light signals over long distances.
Explanation
Why this works
Total internal reflection allows light to be transmitted efficiently through optical fibres, enabling communication over long distances without significant loss of signal.
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