Lect25 - Physics 212 Lecture 25, Slide 1 Physics 212...

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Unformatted text preview: Physics 212 Lecture 25, Slide 1 Physics 212 Lecture 25 Music Who is the Artist? A) The Band B) Bob Seger C) CCR D) Eagles E) Steve Miller Band Why? SOMETIMES PERSISTENCE PAYS OFF. CCR CCR CCR CCR!!!! it means Creedence Clearwater Revival BTW! and they are the best band ever! anyone with style would play this in lecture Physics 212 Lecture 25, Slide 3 Your Comments 05 Finally, something tangible! the swimming pool question is interesting:) We will definitely discuss the pool.. a small demo, even obviously, the checkpoints Hour Exam 3: 2 weeks from tomorrow (Wed. Nov. 30) covers L19-26 inclusive (LC circuits to lenses) Sign up for conflicts, etc. no later than Fri. Nov. 18 at 10:00 p.m. PLEASE ANSWER THIS IN LECTURE!!!!! everyone has been asking if this class is curved at all. none of the TA's know so will you let us know if it is?! THANKS :) Note that the Reflection, Refraction and Lenses HW is now available (due Nov. 29) Can you link polarization in this unit to the polarization from the previous unit? Also, which beam are we considering polarized in the water example, the refracted or the reflected? Well go over the key steps confused about the polarization and E fields of the waves when reflected/ refracted... I'm not sure that I quite understand how the light becomes polarized from the reflection off of a surface. Physics 212 Lecture 25, Slide 4 Lets start with a summary: from n 1 to n 2 from n 1 to n 2 Physics 212 Lecture 25, Slide 5 The speed of light in a medium is slower than in empty space: v medium = c / n medium Remember: is dielectric constant (capacitors) since < Physics 212 Lecture 25, Slide 6 Checkpoint 1a A ray of light passes from air into water with an angle of incidence of 30 degrees. Which of the following quantities does not change as the light enters the water? A. wavelength B. frequency C. speed of propagation Well it stated in the prelecture the speed's change, and the index is frequency dependent so, I'm choosing wavelength. Frequency will eb constant as wavelength and speed change. if wavelength changes then frequency changes therefore it must be speed of propagation. Physics 212 Lecture 25, Slide 7 What about the wave must be the same on either side ??? Checkpoint 1a Observers in both media must agree on the frequency of vibration of the molecules A ray of light passes from air into water with an angle of incidence of 30 degrees. Which of the following quantities does not change as the light enters the water? A. wavelength B. frequency C. speed of propagation Physics 212 Lecture 25, Slide 8 Reflection Physics 212 Lecture 25, Slide 9 Refraction: Snells Law 1 1 2 2 / sin / sin n c D n c D = 1 1 2 2 sin sin n n = Physics 212 Lecture 25, Slide 10 Think of a day at the beach Not the quickest route This one is better What's the fastest path to the ball knowing you can run faster than you can swim? Physics 212...
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This note was uploaded on 03/12/2012 for the course PHYS 212 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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Lect25 - Physics 212 Lecture 25, Slide 1 Physics 212...

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