The endoscope 0.0 / 5 ? PhysicsMedical PhysicsGCSEAQA Created by: CharCreated on: 20-05-13 17:22 What is also seen when a light ray refracts from glass to air? A partially reflected ray 1 of 22 What happens if the angle of incidence in the glass is gradually increased? The angle of refraction increases 2 of 22 Until? The refracted ray emerges along the boundary 3 of 22 What is this angle of incidence called? The critical angle 4 of 22 When does the light ray undergo total internal reflection? When the angle of incidence is increased beyond the critical angle 5 of 22 What is the angle of reflection equal to when total internal reflection occurs? Angle of incidence 6 of 22 What is the equation linking critical angle with refractive index? n= 1/sinC 7 of 22 What is an endoscope A device used to look inside a patient's body 8 of 22 Without? Cutting the body open 9 of 22 When is it used? When performing keyhole surgery 10 of 22 What does the endoscope contain bundles of? Optical fibres 11 of 22 What are these made of? Glass fibres 12 of 22 What are two features of them? Very thin and flexible 13 of 22 What can be sent along the fibres? Visible light 14 of 22 By? Total internal reflection 15 of 22 What is an energy source used in an endoscope to carry out surgical procedures? Laser light 16 of 22 Without? Cutting, cauterising and burning 17 of 22 What is the colour of the laser light matched to? The type of tissue 18 of 22 To produce? Maximium absorption 19 of 22 What can be carried out by using laser light? Eye surgery on the retina 20 of 22 Where does the laser pass straight through? Cornea (at the front of the eye) 21 of 22 Where is it absorbed by? The retina (at the back of the eye) 22 of 22
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