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Today’s agenda: no purple boxes. No purple boxes!

Today’s agenda: no purple boxes. No purple boxes! I am taking a break from purple boxes. You’ve seen your last purple box agenda!. Final Exam. Final. Final Exam. http://www.nearingzero.net (nz386.jpg).

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Today’s agenda: no purple boxes. No purple boxes!

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  1. Today’s agenda: no purple boxes. No purple boxes! I am taking a break from purple boxes. You’ve seen your last purple box agenda! Final Exam Final Final Exam http://www.nearingzero.net (nz386.jpg)

  2. Two lectures ago I showed you these two plots of the intensity distribution in the double-slit experiment: Peak intensity varies with angle. Peak intensity independent of angle. Which is correct?

  3. d <<d d >>d Diffraction Light is an electromagnetic wave, and like all waves, “bends” around obstacles.  This bending, which is most noticeable when the dimension of the obstacle is close to the wavelength of the light, is called “diffraction.” Only waves diffract.

  4. Diffraction pattern from a penny positioned halfway between a light source and a screen. The shadow of the penny is the circular dark spot. Notice the circular bright and dark fringes. The central bright spot is not a defect in the picture. It is a result of light “bending” around the edges of the penny and interfering constructively in the exact center of the shadow. Good diffraction applets at http://ngsir.netfirms.com/englishhtm/Diffraction.htm http://micro.magnet.fsu.edu/primer/java/diffraction/basicdiffraction/ http://www.physics.uq.edu.au/people/mcintyre/applets/grating/grating.html

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