In order to explore the grating diffraction law of optical disc(CD or DVD),taking the"Color Line"of the National Physics Competition for College Students in 2023 as an example,the color change of diffraction fringes of optical disc is studied theoretically and experimentally under the conditions of whether or not the disc is burned,different burning methods and different incident angles of optical path,and the diffraction law of grating on optical disc is explored.The results show that the color of diffraction fringes on the optical disc is related to the structure of the optical disc,the Angle of the incident light and the Angle of the optical disc.The research has a certain theoretical and practical significance for the development of new optical disc materials and technologies.
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