Calagera Pagano_ Interference

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Stony Brook University *

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134

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Physics

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Feb 20, 2024

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STONY BROOK UNIVERSITY DEPARTMENT OF PHYSICS AND ASTRONOMY PHY 134 L06 Lab 10: Interference Name: Calagera Pagano Lab Partner: Quinn Gagliano Teacher Assistant: Yan Mong Chan Experiment Date: 7 December 2023 Report Date: 9 December 2023
Introduction In this lab, we observed interference, diffraction, and the polarization of light. Interference is branched off into three different optical components: a single slit, a pair of slits and a diffraction grafting. In the first part, we examined a diffraction grafting for different slits that have equal spaces. In the second part, we then measure the width of our hair with the tool given to us to see the diffraction. Our hair is defined as a single thin slit. The last part in the lab, we observed the polarization of light for which is the examination of the oscillation directions. Results Explanation of Part 1 Results During part one, we examined two different LED color’s diffraction patterns. Blue and red LEDs were both measured with diffraction graftings of 500 line/mm and 1000 line/mm. With the 500 line/mm we saw the diffraction grafting image lines closer together than the 1000
line/mm. Then we compared the two LED colors. The LED color that is closer together overall between both diffraction gratings is blue. The red LED is more spread out compared to the blue LED. Lastly, we observed how the distance between the screen and laser affects the diffracted images. As we move closer to the wall/screen closer to the laser, we see the distance between the lines/spots decrease. Discussion Topic Multiple Polarizers If we use Malu’s law, we can explain and interpret the results we got for part three of the experiment. When the laser light intensity disappears, this is due to the angle that the laser is being polarized from being compared to the angle the polarizer makes at a degree of 90. This makes the intensity zero due to the orientation of the light being canceled out. We see that the light stays the same as well, which means the polarizers are being canceled out with each other by the orientation of the angles. Calculations The calculations are shown in the excel sheet that is attached to my submission. Conclusion Throughout this lab, we grasped a stronger understanding of diffraction, interference, and polarization. Unfortunately, our hair thickness (diffraction) was not within agreement with our expected value. But we can say we succeeded in seeing that the diffracted image was affected by the diffraction grafting, distance and LED color. The effect of multiple polarizers on light
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intensity was also seen in the experiment as well. A lot of errors could have taken place but overall I would say this and the optics lab were fun experiments and I am disappointed the results didn’t come out better.

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