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Lab 9.5 - Randall Robert(9771 Jacob Porta(7090 Optical...

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Randall Robert (9771) Jacob Porta (7090) Optical Electronics Lab EE 4270 Experiment 10 Zone Plates Tuesday; December 6, 2005 1
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Introduction: Zone plates are patterns that focus light by means of diffraction. Circular zone plates consist of a series of concentric rings or zones resembling a, “bull’s eye”. The zones form a grating, which diffracts light towards, or away, from their common center. This week’s laboratory experiment will involve the use of zone plates which are circular and linear. Figure 1: After constructing the above figure the following data was recorded with the circular zone plate with the black background in place. The distance from the laser to the zone plates = 98.5 [cm] The distance from the zone plates to the objective = 54 [cm] The distance from the objective to the screen = 48 [cm] The size of the image on the screen = 1.3 [cm] The magnification of the image = 13X The focal length of the zone plate = [1/S1]+[1/S2]=1/98.5+1/48 = 30.9[cm] After constructing the above figure the following data was recorded with the circular zone plate with the transparent background in place.
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