1. 5/1/06 Fiber Optics (continued) CD’s & DVD’s Poster Session: 2 – 5 pm Show up between 1:30 and 2 (if possible) to set up Schedule Reviews HW #8 due Wed. by 5 pm Upcoming Office Hours Tuesday: 10:30 – noon Wednesday: 9 – 11:30; 1:30 – 4 Thursday: 9 – 11:30, 1:30 – 4 Friday: 9 – 11:30; 1:30 – 4 Sunday: 3 – 5 Exam III on Monday May 8, 11: 45 am LRSN 100 Sec. 9.2: Musical Instruments (wave stuff) Chap. 12: Electronics Chap. 13: Electromagnetic Waves Chap. 14: Light Chap. 15: Optics Lab #9: Magnetic Memory Lab #10: Polarization and Refraction of Light Lab #11: Lenses and Images

2. Law of Reflection: “Angle of Incidence = Angle of Reflection” Law of Refraction “Snell’s Law”:

3. Refraction Example: A light ray starts in a medium with index of refraction n 1 and goes into a medium with index of refraction n 2. The angle of incidence is  1. The angle of refraction (transmission) is  2. a) If n 1 < n 2, where is the light ray traveling fastest? b) If n 1 < n 2, which is larger,  1 or  2 ? c) A beam of light is incident on the interface between plastic ( n = 1.3) and air with a 40 o angle as shown. What is the angle of the refracted ray? 40 o plastic air

4. Total Internal Reflection:

5. Application: Total Internal Reflection and Fiber Optics

6. Diffraction & Interference http://surendranath.tripod.com/Applets.html

7. Storing Information on a CD or DVD

8. Storing & Reading Digital Optical Information

9. Optical Reading Optical System