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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