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'A' Level Medical Option Questions - The Endoscope

Q5.

(a) The diagram shows the cross-section through a clad optical fibre which has a core of refractive index 1.50.

Complete the graph below to show how the refractive index changes with the radial distance along the line ABCD.

 

(3 marks)

(b) In the optical system of a flexible endoscope there are two types of fibre bundles, coherent and non-coherent. Explain the purpose of each of these two types of bundle.

Use of non-coherent to transmit light into body/ provide illumination

Use of coherent to transmit image/ light to form an image (from inside to viewer/camera)

(2 marks)

(5 marks Total)