Wednesday, May 30, 2012

Lab 12: CD Diffraction

Lab Purpose:
     Determine the size of the holes that are burned into the disc by examining the diffraction pattern
     that appears when a laser is shone on the recording side.

Part 1: Experiment


     This is a picture of our setup, the laser strikes the cd and bounces back slightly at an angle
     towards the laser. We then have a whiteboard placed right next to the point of emission and we
     measure the distance from the center and use that as our maxima distance.


     Calculations are quite trivial as it's mostly simple algebra. The value we obtained is
     1.5645 ± .0035 micrometer. The standard value is 1.6 micrometers, which means our value has
     an error of 2.2%.

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