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4 Pages

### Lab 2

Course: PHYSICS 1A+1B, Fall 2010
School: Laney College
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Word Count: 488

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Gratings Instructor: Pro. Lab4 Diffraction Tsai Jiajie Huo(Jacky) Member: Yao Bin Yu Zeyuan (Seth) Guan 1. introduction. In this experiment, we are generally focusing on information about inference and diffraction. 2. Procedure. a. In section 1, we align the diode laser and shine it through one of the one- slit gratings on the 3*5 grating plate. Then we choose the 7th bright spots and the distance from the...

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Coursehero >> California >> Laney College >> PHYSICS 1A+1B

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Gratings Instructor: Pro. Lab4 Diffraction Tsai Jiajie Huo(Jacky) Member: Yao Bin Yu Zeyuan (Seth) Guan 1. introduction. In this experiment, we are generally focusing on information about inference and diffraction. 2. Procedure. a. In section 1, we align the diode laser and shine it through one of the one- slit gratings on the 3*5 grating plate. Then we choose the 7th bright spots and the distance from the central maximum l=1cm. In Q1, we did the sketch pattern on the graph paper. The orders we are seeing aroused from both interference and diffraction. In Q2, we got the experimental width of it was d=0.11mm, while the real width of it was do=0.088mm, so the difference of them is 25%. In Q3, we predicted that when the spectrum would spread out when the width of the slit decrease and spectrum would be condense when the width of the slit increase. We changed the width of the slit to d0=0.176mm and the experimental one was d=0.228mm, so the difference was 29.5%. In Q4, the prediction was correct because when we increased the width of the slit, the spectrum would be condense. b. Then we shine the laser through a double-slit grating. In Q5a, we sketched spectrum from the double-slit and the graph of the intensity of light vs distance from center of the screen. The experimental slit separation was 0.185mm, the real slit separation was 0.175mm, so the difference of them was 5.7%. In Q5b, we predicted that spectrum would spread out when the slit separation decreased and spectrum would be condensed when the slit separation increased. We used double-slit the grating with slit separation of 0.35mm, and the experimental slit separation was 0.31mm, so the difference was 11.4%. In Q6, the prediction was correct. c. We shined the laser through several two-slit gratings until we saw one with a clearly missing order. We record the slit separation d was 1.35cm and it was the 5th dark spot and 11th bright spot. In Q7a, the ratio of a/d is 5/11. In Q7b, 4. Data Sheet Intensity vs Angle 600 y = 0.0345x 2 - 6.5284x + 547.7 R2 = 0.9423 Int en sit y( lm) 500 400 300 200 100 0 0 50 100 150 angle(relative degree) Section 3 1st=0degree 3rd=10 degree Angle(relative) 0 15 30 45 60 75 90 105 120 135 150 165 180 2nd =90degree max=165lm Intensity(lm) 165 164 134 114 105 103 106 108 119 123 132 150 172 200 Intensity vs angle 200 180 y = 0.0083x2 - 1.4889x + 170.78 R2 = 0.9482 160 Int en sity( lm) 140 120 100 80 60 40 20 0 0 50 100 150 200 angle (relative angle) 6. Discussion and conclusion. In this experiment, we have three sections. First, we used one polarized and found that there was no variation in intensity by only one polarization. Second, we placed two polarizers and draw the intensity versus angle graph showing the relationship between the angle of the two polarizers and the intensity. We found that the curve was parabola and the parabola is symmetry, as expected. In section 3, just like the section 2, we added one more polarizer and do the curve reflecting the relation between intensity and angle. Again, it was a parabola and it was symmetry, as expected.
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