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Unformatted text preview: Experiment 12 Polarized Light Introduction There are four parts to this weeks lab on polarization. In Part 1 you will do an experiment with linearly polarized light. Part 2 will deal with circularly polarized light. Parts 3 and 4 will deal with several observations of the effects of polarized light. 1 Linear Polarization Procedure In Part 1 you will use a prism spectrometer to measure reflected linearly polarized light. From this work you will obtain data allowing you to derive the index of refraction of the prism in the region of the sodium D lines. There are three polarizer holders associated with the spectrometer. The first holder is independently mounted between the light source and the collimator; this holder contains the reference polarizer. A second holder is mounted directly on the objective end of the telescope and referred to as the analyzer . A third holder, to be placed on the collimator later, will be used for mounting a circular polarizer in Part 2. First the scale on the base of the spectrometer needs to be calibrated since a reading of 180 degrees may not mean the telescope cross hairs are aligned with the slits. Then you need to set the scales of the holders. Set the telescope cross hairs on the image of the slits. Record the reading from the base of the telescope. Use this to correct all other readings from the spectrometer. Put the reference polarizer in front of the collimator. Set the reference polarizer to 0 degrees. This will polarize the light vertically. Clamp the analyzer adapter to the telescope objective lens. Leaving the reference polarizer in, rotate the analyzer scale to 0 degrees. Place a linear polarizer in the holder. Rotate the analyzer holder to 90 degrees. Now, without moving the holder, rotate the polaroid within the analyzer holder until there is no longer an image of the slits in the telescope. This sets the pass direction of the analyzer to the horizontal plane. From this point on, no relative motion between the analyzer polaroid and the movable degree scale is allowed. Now you can begin to take data.scale is allowed....
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