1. Refraction   Refraction   When light bends as it passes from one material to another due to a change in speed Optical illusions 9/13/2015APHY1011

2. Refraction   Index of Refraction   The ratio of the speed of light in a vacuum to the speed of light in a material   Depends on the wavelength of the light Short wavelength light has a greater index of refraction 9/13/2015APHY1012

3. Refraction   Snell’s Law   Relation between the light’s path through a material and the material’s index of refraction n i sin θ i = n r sin θ r 9/13/2015APHY1013

4. Refraction   Why refraction occurs   The least amount of time for the light to travel between two points A and B Fermat’s Principle 9/13/2015APHY1014

5. Refraction   Total Internal Reflection   Light is completely reflected at the interface between two materials 9/13/2015APHY1015

6. Refraction   Total Internal Reflection   Applications: binoculars, diamonds, fiber optics 9/13/2015APHY1016

7. Refraction   Dispersion   Each color of light refracts by a different amount due to its wavelength – the speed of light changes 9/13/2015APHY1017

8. Refraction   Dispersion 9/13/2015APHY1018

9. Refraction 9/13/2015APHY1019

10. Lenses   Lenses   Similar to a set of small prisms Converging Diverging 9/13/2015APHY10110

11. Lenses   The human eye   Near point, far point and 20/20 vision 9/13/2015APHY10111

12. Lenses   Laser eye surgery   Nearsightedness, Farsightedness and surgery 9/13/2015APHY10112

13. Lenses   Telescopes 9/13/2015APHY10113

14. Lenses   Telescopes 9/13/2015APHY10114

15. Lenses   Telescopes 9/13/2015APHY10115

16. Lenses   Telescopes 9/13/2015APHY10116