1. Today’s lesson Critical angle Total internal reflection Dispersion

2. Critical Angle? i

3. i

5. i

6. Critical Angle Critical angle (when angle of refraction is 90º) i

7. Critical Angle The Critical angle is the angle of incidence that produces an angle of refraction of 90º Copy! 90º Critical angle

8. Critical Angle The Critical angle is the angle of incidence that produces an angle of refraction of 90º Copy! 90º Critical angle

9. Total Internal Reflection Bigger than Critical angle

10. Examples of Total Internal Reflection