TIR

• What is refraction?

  When light enters a medium and bends due to a change in speed.
• What is the relationship between the angle of incidence and the angle of refraction?

  As the angle of incidence increases, the angle of refraction also increases
• What is TIR?

  When a ray of light is increased past the critical angle, causing the light to reflect
• What are the conditions needed for TIR?

  Light must be travelling towards a lower optical density

  Angle of incidence > Critical angle