1. PHY138 – Waves, Lecture 8 Today’s overview:
Apparent Depth
Rainbows
Formation of Images by Lenses
Anatomy of the Human Eye
Laser as seen on TV and movies
Real Laser
Real Laser Shining Through a Cloud

2. Reading Assignment
Next week’s reading is Knight Chapter 23, Sections 23.7 – You will not be tested on this material this semester, but it may be part of the final exam.
A Problem Set on Chapter 23 (up to 23.6) is due on Friday at 5:00PM. It is the last problem set of the semester

3. Course Evaluations in Tutorial this week!
Your chance to officially evaluate Professor Harrison and me is this week during tutorial.
Your comments will make it into the Anti-Calendar and will form part of my tenure-review in 2009.
You participation and honest comments are appreciated – we will read them in the summer after the marks have been submitted.

4. Second Representative Assembly Friday!
Friday, Dec.2 at 3:00 PM in MP606
One or two “representatives” from each tutorial group are invited. (Please select yourselves during tutorial.)
Refreshments will be provided!
I will be there and I’m interested in hearing your thoughts on issues of communication and structure of this course.
Professor Strong will be there – she’s your next prof!

5. Now Posted on the web site:
Solutions to last week’s written problem set
Room assignments for next week’s Test. Find out what room on campus you will be writing in, based on your tutorial group. Click on “Test 2” on the main course web site.

6. Apparent Depth

7. Apparent Depth

8. Dispersion

9. Light going through a prism bends toward the base

12. Rainbows

13. Rainbows

14. Rayleigh Scattering

15. Converging Lens Focal length, f Focal Point
NOTE: Focal length is defined for initially parallel rays.

16. Diverging Lens Negative Focal length, -f Virtual Focal Point
Rays appear to emerge from Virtual Focal Point

17. Diverging rays through a Converging Lens
Focal length, f
This follows from the principle of reversibility.