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Important Announcements and Updates for Term Projects and Exams

This announcement provides important information about term projects, exams, and reading quizzes for the physics course. It also includes details about office hours, review sessions, and resources for studying.

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Important Announcements and Updates for Term Projects and Exams

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  1. Announcements 3/4/11 • Prayer • Slinky turn-in • Term projects: • Make sure you got emailed feedback from me • Make sure you have a score for “Project 1”, via website grade report • Can you change topics? Yes, but send me a new proposal. • Exam 2 starts tomorrow, goes through next Sat • Covers through tonight’s HW. • Can bring handwritten 3x5 card (both sides). Just one! • Exam review session this afternoon, 3:30 - 5 pm, C261 • Remember to come with questions: HW problems, worked problems & concepts from class, demos, labs, Exam 1 problems/multiple choice questions, etc. • TA office hours today: 5:00 - 6:30 pm

  2. Reading Quiz • Which of the following scientists did not attempt to make a measurement of the speed of light? • Einstein • Fizeau • Galileo • Roemer • Michelson (OK, this is not the answer, but I felt his name should be included on the list even though he wasn’t mentioned in today’s reading, because he performed the “canonical experiment”)

  3. The wave nature of light • Speed of light…how did each of the people on the preceding slide measure it? • What is “waving”? http://stokes.byu.edu/emwave_flash.html • Medium? Advertisement for Phys 471

  4. Reading Quiz • A beam of light passes through a hole of diameter d in a metal plate. Under what condition are we allowed to ignore the diffraction or “spreading” of the light? (This is called the ray approximation.) • When λ << d • When λ ≈ d • When λ >> d

  5. Next three slides: image credit to Dr. Durfee

  6. Index of Refraction v = c/n • Book table

  7. Index of Refraction Different wavelengths have different speeds! • Song: Roy G. Biv v = lf linside = lvacuum/n Different frequencies have different speeds! Dispersion! (l going into material) blue green red Image: http://en.wikipedia.org/wiki/Dispersion_(optics)

  8. Thought question • Which color of light travels fastest in glass? • Red • Green • Blue • Same

  9. Absorption • “Lorentz model” “anomalous” index of refraction index of refraction absorption increasing frequency (decreasing l) From Peatross & Ware, textbook for Phys 471 Why is blue light slower through glass than red light?  It’s closer to an absorption region

  10. fast light (smaller n) q1 slow light (larger n) q2 Index of Refraction • Light ray at boundary

  11. fast light (smaller n) q1 slow light (larger n) q2 Snell’s Law • n1sinq1 = n2sinq2 Advertisement for Phys 442/471

  12. Law of Reflection • qrefl. = q1 fast light (smaller n) qrefl. q1 Reflections occur off of any boundary, not just via mirrors slow light (larger n) q2 When will you have no reflection?

  13. Fresnel Coefficients / Fresnel Equations • If near perpendicular (1-D problem) Look familiar?? • For arbitrary angle (these eqns not needed for HW/exam) Advertisement for Phys 442, Phys 471

  14. top bottom Thought question • I send white light into a prism as shown below (n>1). Will the red part of the “rainbow” be on the top or the bottom of the outgoing fan of light? • top • bottom

  15. Demos • Reflection/refraction using water-soluble oil • “Blackboard optics”

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