The total internal reflection of waves

• TIR

  total internal reflection
• what form of information transfer makes use of TIR

  optical fibres
• 2 uses for optical fibres

  . high speed internet connections

  . endoscopes
• what condition relating to the incident angle of the wave, must be met for TIR to occur

  angle of incidence must be greater than the critical angle
• what is the critical angle

  the angle beyond which the wave will be fully reflected at the boundary between two mediums
• what is the critical angle in terms of angles of incidence and refraction

  the critical angle is the angle of incidence which produces a 90 degree angle of refraction
• what is a CT scan

  medical scanner that uses X rays
• 2 advantages of CT scans over endoscopy

  . CT scans are non invasive

  . CT scans can produce more detailed images of organ
• advantages of endoscopy over a CT scan

  endoscopy doesn't involve exposure to X ray radiation, which in large doses can cause harm to body cells