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5/1/06 Upcoming Office Hours Fiber Optics (continued) Tuesday: 10:30 – noon CD’s & DVD’s Wednesday: 9 – 11:30; 1:30 – 4 Thursday: 9 – 11:30, 1:30 – 4 Poster Session: 2 – 5 pm Show up between 1:30 and 2 (if possible) to set up Friday: 9 – 11:30; 1:30 – 4 Sunday: 3 – 5 Schedule Reviews HW #8 due Wed. by 5 pm 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 Law of Reflection: “Angle of Incidence = Angle of Reflection” 1 1 Law of Refraction “Snell’s Law”: n1 sin 1 n 2 sin 2 Refraction Example: A light ray starts in a medium with index of refraction n1 and goes into a medium with index of refraction n2. The angle of incidence is 1. The angle of refraction (transmission) is 2. a) If n1 < n2, where is the light ray traveling fastest? b) If n1 < n2, 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 40o angle as shown. What is the angle of the refracted ray? plastic 40o air Total Internal Reflection: Application: Total Internal Reflection and Fiber Optics Diffraction & Interference http://surendranath.tripod.com/Applets.html Storing Information on a CD or DVD Storing & Reading Digital Optical Information Optical Reading Optical System