Optical Fibres

2 marks · Easy

State two different applications for optical fibres. For each, give a reason why optical fibres are a suitable choice.

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Must show: Each application plus valid reason

Also accept: Telecommunications: transmits data quickly with low loss; Endoscopes: allows viewing inside the body because light travels through bends

Common mistakes: Listing medical use only; No explanation for why suitable

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Marking points

B1 · 1 mark · Gives one correct application and valid reason

B2 · 1 mark · Gives a second correct application and valid reason

Worked solution

- Telecommunications: fibres allow high-speed long-distance transmission of signals because light travels fast with little energy loss. - Industrial inspection: fibres can be threaded through tight spaces in machinery to transmit images because they are flexible and transmit light around bends.