Total Internal Reflection

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• 2. a machine used to see inside the body, made of optical fibres (10)
• 3. Carry visible light over long distances (7, 6)
• 5. Total internal reflection only works when light travels from a ... material to a ... material (5, 4, 5)
• 6. endoscopes are used in what type of surgery? (7)
• 7. A dense material with a high refractive index has a (3, 8, 5)
• 8. If the angle of incidence is greater than the critical angle no light comes out, it's all (10, 9)
• 9. What do the two tubes in an endoscope provide? (5, 3, 5)