1. Chapter 14 Review

2. Refraction When does refraction occur?
Refraction occurs when light with enters a medium with a different optical density that the original medium.

3. How Does Light Refract?
When light enters a more dense medium it bends towards the normal.
When light goes from a more dense to less dense medium, it bends away from the normal.

4. Snell’s Law
Snell’s Law is described as: Initial Sine(θ) x Initial index(First medium)= Refraction Sine(θ) x refraction Index(Second Medium).
These two videos explain it well.
1st Video
2nd Video
Try to pause the 2nd video at 2:00 and work it out yourself if you can.

5. Converging Lenses
Have 3 different rays to be drawn to find image location: Parallel, Center, and Focal.
Parallel-Top of the object parallel to the axis, bends towards the focus after hitting the lens.
Center-Goes from the top of the object to the center of the lens straight through.
Focal- Goes from the top of the object, through the focus, and bends parallel to the axis after hitting the lens.

6. Converging Lenses Cont.
hi- Image height.
ho- Object height.
do-Distance of the object.
di- Image distance.

7. Diverging lenses.
3 principal rays, same a converging but do different things.
Parallel- Parralell to axis until hits lens, bounces up away from axis.
Focal- Goes towards focus, but parallels when it hits the lens.
Central- Goes directly through the center of the lens.

8. Thin-Lens equation
5 minute long video explaining the thin lens equation.

9. Lens Magnification
Brief use of magnification equation.

10. How Are Lenses Used to Correct Near and Far Sightedness?
For nearsightedness diverging lenses are used, they move the focus closer to the eye.
For far-sightedness converging lenses are used because they move the focus further.