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

Reading Assignment Next week’s reading is Knight Chapter 23, Sections 23.7 – 23.8. You will not be tested on this material this semester, but it may be part of the final exam. A www.masteringphysics.com 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

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 2006-07 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.

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!

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.

Apparent Depth

Apparent Depth

Dispersion

Light going through a prism bends toward the base

Rainbows

Rainbows

Rayleigh Scattering

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

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

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