5(a) State one medical use for optical fibres - Edexcel - GCSE Physics - Question 5 - 2017 - Paper 1
Question 5
5(a) State one medical use for optical fibres.
(b) Light is shown down an optical fibre as shown.
The intensity of the light coming out of the fibre is 5.0 W/m².
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Worked Solution & Example Answer:5(a) State one medical use for optical fibres - Edexcel - GCSE Physics - Question 5 - 2017 - Paper 1
Step 1
State one medical use for optical fibres.
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Answer
One medical use for optical fibres is in endoscopy. This technique allows doctors to look inside the body through a narrow tube equipped with a light source and camera.
Step 2
(i) Calculate the intensity of the light as it enters the fibre.
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Answer
To determine the intensity of the light as it enters the fibre, we start with the output intensity:
The light intensity coming out of the fibre is 5.0 W/m².
If 1% of the intensity is lost, then 99% of the intensity remains:
