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. (i) 1% of the intensity is lost as it travels through the fibre. Calculate the intensity of the light as it enters the fibre.

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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. ... show full transcript

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:

ext{Intensity}_{ ext{input}} = 5.0 ext{ W/m}^2 imes rac{100}{99} \\ ext{Intensity}_{ ext{input}} ext{ } \approx 5.05 ext{ W/m}^2$$

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5(a) State one medical use for optical fibres - Edexcel - GCSE Physics - Question 5 - 2017 - Paper 1

Worked Solution & Example Answer:5(a) State one medical use for optical fibres - Edexcel - GCSE Physics - Question 5 - 2017 - Paper 1

State one medical use for optical fibres.

(i) Calculate the intensity of the light as it enters the fibre.

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