Interference diffraction grating set for optical experiments and demonstrations. Precision plastic gratings and patterned plates produce clear diffraction and interference patterns for study, measurement, and creative lighting effects. Key features Complete set of patterns: single seam, double seam, point array, grid, and composite combinations including single seam, double seam, three seam, four seam, multiple lines, round hole, triangle, square, and rectangle. Single seam options: seam width 0.05, 0.1, 0.2m for varying single slit diffraction. Double seam options: seam width 0.05M with spacing of 0.2, 0.3, 0.45mm to support classic double slit experiments. Point array sizes: point diameters 0.2, 0.3, 0.4. Grid line densities: 20, 40, 60 lines/MM in a 90 degree cross line configuration for two dimensional diffraction patterns. Composite part details: seam width of 1 seam, double seam, three seam and four seam is 0.06mm with spacing 0.05mm and overlapping patterns; multiple line densities of 30 lines/mm and 60 lines/mm; round hole diameter 0.36m; triangle side length 0.3mm; square side length 0.2mm; rectangle side length 0.6 times 0.28mm. Material and size: made from plastic, size and color as shown in product images. Package content: 1 x round hole grid. Why choose this set Versatile: wide range of seam widths, spacings, point sizes, and line densities supports many experimental setups without needing multiple separate purchases. Accurate patterning: precise dimensions yield reproducible diffraction and interference results for demonstrations and measurements. Durable and easy to handle: plastic construction keeps components lightweight and convenient for classroom use, hobby optics, and field demonstrations. Typical applications Physics classrooms and labs: demonstrate single slit, double slit, multi slit, and two dimensional grid diffraction and measure fringe spacing and wavelength. Hobby optics and laser experiments: use with low power laser or LED sources to create and analyze interference patterns and verify line densities. Imaging, photography, and lighting effects: create decorative diffraction patterns and light textures for creative projects and displays. Additional information Part name: Interference diffraction grating set. Material: Plastic. Size and color: as shown. Package content: 1 x round hole grid. Note: Actual item color may vary slightly from images due to monitor and lighting differences. Please allow slight manual measurement deviation for the data.