Experiment_4A - Experiment 4A Prism Spectrometer Procedure Outline This week's lab covers dispersion in a prism and the prism spectrometer 1

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Experiment 4A Prism Spectrometer Procedure Outline This week's lab covers dispersion in a prism and the prism spectrometer. 1. Spectrometer Alignment Procedure In the first section, you will align the spectrometer with the prism. The spectrometer has three major components. First there is a collimator. This is a slit arid a lens with the slit at the focal point of the lens, so that the lens will produce parallel light from the slit. Next there is a table which will hold the prism. Finally there is a telescope, which can rotate about the central axis. It has a vernier scale marked in degrees and minutes. The telescope is aligned first. Check to make sure that the crosshairs in the telescope are in focus. If they are not, move the eyepiece until they are. Remember, once set, the eyepiece should not be moved. Now you can focus the telescope for infinity using autocollimation. Take the small metal mirror and place it on the spectrometer table. The eyepiece has an illuminator on it. Make sure that this is on and that light is shining into the telescope. Rotate the mirror until the light is reflected back into the telescope. You should be able to see the light in the telescope. If the telescope is still in focus, you will see an image of the crosshairs. If not, you will need to adjust the telescope. Do not move the eyepiece to do this; if you do, the crosshairs will be out of focus. There is a screw on the side of the telescope which locks the objective into place. Loosen the screw and move the eyepiece tube until the reflected image of the crosshairs is in focus, then
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This note was uploaded on 12/09/2011 for the course PHYS 450 taught by Professor Staff during the Fall '08 term at Purdue University-West Lafayette.

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Experiment_4A - Experiment 4A Prism Spectrometer Procedure Outline This week's lab covers dispersion in a prism and the prism spectrometer 1

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