What is the role of the non-coherent fibre bundle in a flexible endoscope?
It carries light from an external source to illuminate the internal region.
AQA A-level Physics (7408) · 3.10.4.2
Revise AQA A-level Physics (7408) specification point 3.10.4.2, Fibre optics and endoscopy (A-level only), with free active-recall flashcards. Flip through the set or review every question and answer below.
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What is the role of the non-coherent fibre bundle in a flexible endoscope?
It carries light from an external source to illuminate the internal region.
Why need the fibres in an endoscope’s illumination bundle not retain their relative positions?
The illumination does not need to preserve an image.
What does the objective lens do in a flexible fibre-optic endoscope?
It forms an image at the end of the coherent fibre bundle.
How does a coherent fibre bundle preserve the spatial arrangement of an image?
Its fibres retain their relative positions from one end to the other, so light from different image points remains in the corresponding arrangement.
In a coherent fibre bundle, what does coherence refer to rather than the phase coherence of light?
The spatial arrangement of the fibres.
What is the role of the eyepiece or viewing system in a fibre-optic endoscope?
It allows the transmitted image to be observed.
How can a flexible endoscope avoid the need for open surgery solely to inspect an internal region?
It provides direct visual information through a natural opening or a small incision.