# Announcements 10/26/12

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Announcements 10/26/12  Prayer  Exam 2 going on…3 people taken it so far a.Expected time?  Slinkies: Please turn in and cross your name off the…
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Announcements 10/26/12  Prayer  Exam 2 going on…3 people taken it so far a.Expected time?  Slinkies: Please turn in and cross your name off the sign-out list, if you haven’t yet Overboard From warmup  Extra time on? a. (nothing mentioned by more than one student)  Other comments? a. Why does it stop at homework 20? How do we see our other scores? From warmup  Huygen's principle as stated in the textbook involves wave fronts . What is a wave front? a. they are the crests of the waves of light b. A wave front is a bunch of points having the same phase. Law of reflection illustrated Credit: next several slides from Dr. Durfee Law of reflection illustrated Law of reflection illustrated Law of reflection illustrated Law of reflection illustrated Law of reflection illustrated Snell’s Law illustrated Snell’s Law illustrated Snell’s Law illustrated From warmup  What does Snell's law have to do with total internal refraction? a. (my answer) TIR happens when Snell’s law predicts that a refracted beam is impossible Demo  Stokes computer demo: (5:00) http://stokes.byu.edu/teaching_resources/refract_script_flash.html Total Internal Reflection  TIR: the equation Demos  Blackboard optics  TIR in water soluble oil  Laser captured in stream of water  Fiber Optics Clicker question:  If you have a -0.3 dB change, the final intensity is what fraction of the initial intensity? (You’ll need your calculator.) a. 78% b. 83% c. 88% d. 93% e. 98% -0.3 dB  93.3% -0.2 dB  95.5% -0.1 dB  97.7% Clicker question:  When we think of all the points on a wave front as little sources of secondary waves in order to calculate what the wave front will look like after propagating some distance, we are using the idea known as... a. the Equivalence theorem b. Huygen’s Principle c. Fermat’s Principle d. Newton’s first law of optics e. the Wavelet theorem Huygen’s Principle Image credit: Wikipedia  Each wavefront serves as source of spherical waves  HW 26-5 (extra credit): a. “Stare at the picture until you can visualize that the green lines tangent to the circles connect matching wavefronts.” b. Construct an accurate picture like this for a specific situation, show graphically that it gives you Snell’s law Huygen’s Principle, cont. Image credit: Wikipedia http://en.wikipedia.org/wiki/ Double-slit_experiment  A wave hits the two slits  Each slit (infinitely narrow) becomes source of spherical waves  The waves from those two sources interfere with each other Spherical Waves Credit: the next few slides are from Dr. Durfee Huygen’s Construction of a Spherical Wave Huygen’s Construction of a Plane Wave
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