Periodic systems play an important role in science and technology. In the early 20th century, X-ray crystallography was developed, which took advantage of the diffraction of light on periodic structure of matter to determine its microscopic composition. Here I present the study of interference image of light from a digital screen with a goal to determine its structure. From the interference image, I determined the shape of each pixel and the grid parameters. I additionally checked the structure of the screen with a light microscope and made a comparison between the microscopic structure and the interference image.
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