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An endoscope uses glass fibres to enable doctors to 'see' inside a person - Edexcel - GCSE Physics - Question 5 - 2015 - Paper 1
Question 5
An endoscope uses glass fibres to enable doctors to 'see' inside a person. Complete the sentence by putting a cross (X) in the box next to your answer. Rays of lig... show full transcript
Worked Solution & Example Answer:An endoscope uses glass fibres to enable doctors to 'see' inside a person - Edexcel - GCSE Physics - Question 5 - 2015 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
Answer
Rays of light travel along the glass fibres by C total internal reflection. This phenomenon occurs when light travels from a medium with a higher refractive index to a lower refractive index, causing the light to be completely reflected back into the medium, allowing efficient transmission of light through optical fibres.
Step 2
Complete the diagram to show the path of the ray of light inside the glass block.
Answer
To complete the diagram, draw a straight line from the ray box towards the edge of the semicircular glass block. After the ray hits the curved surface of the block, illustrate it being refracted inside the glass, bending towards the normal line at the point of incidence, and reflecting back towards the center of the block, demonstrating the principle of total internal reflection.