1. AP Physics
Mr. Jean
March 2nd, 2012

2. The plan: Refraction & dispersion Len & mirror videos
Examples & Diagrams
Convex mirror (spherical mirror)
Quest assignment reminder

3. Wave through an opening:
Next three slides: image credit to Dr. Durfee

6. Index of Refraction
v = c/n

7. (l going into material)
Index of Refraction
Different wavelengths have different speeds!
v = lf
linside = lvacuum/n
Different frequencies have different speeds!
Dispersion!
(l going into material)
blue
green
red
Image:
Song: Roy G. Biv

8. Index of Refraction Light ray at boundary fast light (smaller n)q1 q2
fast light
(smaller n)
slow light
(larger n)

9. Demo 6.1:
White light through a mirror.

10. Snell’s Law n1sinq1 = n2sinq2 fast light (smaller n) slow light
(larger n)
n1sinq1 = n2sinq2

11. Demonstration: 6.2
Total internal reflection.

12. Fresnel Coefficients & Equations
If near perpendicular (1-D problem)
For arbitrary angle

13. Law of Reflection qrefl. = q1 fast light (smaller n)
Reflections occur off of any boundary, not just via mirrors
slow light
(larger n) q2

14. Image Formation:
Video
6.3 to 6.6

15. Convex/converging Lens
at each interface, Snell’s law is satisfied f
if not parallel, they converge (image formed) at a different point
parallel rays converge to the focal point

16. Where will image be formed?
focus
focus
Ray diagram just like one for concave mirror, except rays continue to right instead of reflecting back!
The equation:
Magnification same:
positive q = right hand side of lens

17. Concave/diverging Lensf
parallel rays seem to be coming from the focal point

18. Diverging lenses virtual image! The equation: (negative f)
Negative q: means image on same side of lens as object (virtual)

19. Thick lenses and surfaces
Careful with signs!!!
(see table 36.2)
Lens-makers’ eqn:

20. Convex Mirror:
An object is 15 cm from the surface of a reflective spherical Christmas-tree ornament 6cm in diameter.
What is the position of the image?

23. Quest Course Name: AP_Phy Unique Name: AP_Phy_MHS_2012
Register for this course.
Assignment #1
Optics
Due on March 9th, 2012
*** It may be listed under Fall2011 as opposed to Winter Double check this.***