What's included and why it matters - 5-piece interference/diffraction grating set: single-slit, double-slit, round-hole (aperture) plate, mesh grating, and a composite grating. These five elements give you the most commonly used aperture and grating types in one compact kit so you can run multiple optical experiments without swapping parts or buying separate components. Key specifications (consistent with the original product) - Single-slit widths: 0.05 mm, 0.10 mm, 0.20 mm - Double-slit center-to-center separations: 0.20 mm, 0.30 mm, 0.45 mm - Circular aperture (point) diameters: 0.20 mm, 0.30 mm, 0.40 mm - Grating line densities: 20, 40 and 60 lines per millimeter Primary benefits — why you need this set - Versatility: Multiple slit widths, separations, aperture sizes and line densities let you run a wide range of interference and diffraction experiments with one kit. - Accuracy and repeatability: Precisely defined slit widths, spacings and line densities produce consistent diffraction patterns suitable for measurement and comparison. - Time and cost savings: One compact kit replaces several single-purpose parts, simplifying setup and reducing procurement time. - Suitable for teaching and research: Designed for classroom demonstrations, lab practicals and experimental work in optics and physics. Function and performance - Produces clear interference and diffraction patterns when used with coherent and partially coherent light sources (e.g., lasers, monochromatic lamps). - Multiple line densities let you select resolution and angular dispersion appropriate to your experiment: lower line density for wider fringe spacing, higher density for finer patterns. - A variety of slit widths and separations allow exploration of single-slit diffraction, double-slit interference, Fraunhofer/Fresnel regimes and aperture diffraction. Compatibility and typical setup - Works with standard optics benches, alignment mounts, laser modules and experimental benches used in undergraduate and graduate labs. - Can be combined with screens, cameras, photodetectors or spectrometers to record and analyze diffraction patterns. - Compact enough to integrate into classroom demonstrations, portable lab kits, or bench-top research setups. Three practical use scenarios 1) Classroom demonstration: Use the single-slit, double-slit and grating elements to demonstrate basic wave optics concepts—diffraction patterns, interference fringes and the relationship between slit geometry and fringe spacing—allowing students to visually compare results from different slit widths and separations. 2) Wavelength measurement: Use the 20/40/60 lines per mm gratings with a laser source to measure wavelength from diffraction angles. The multiple line densities make it simple to choose a geometry that produces measurable angular separation on your screen or sensor. 3) Laboratory experiments and student projects: Test the transition between Fraunhofer and Fresnel diffraction with different aperture sizes and distances, or quantify fringe visibility and coherence by comparing patterns produced by the round apertures and slit combinations. What makes this set stand out - Comprehensive selection of aperture types and well-defined dimensions in one kit, enabling a broad range of standard optics experiments without guessing or improvising. - Clear, repeatable parameters (slit widths, separations, aperture diameters and lines/mm) that support quantitative analysis, not just qualitative observation. Usage tips - Align the plates perpendicular to the beam and use a stable mount to minimize alignment errors. - For best results with double-slit interference, use a coherent monochromatic source and keep ambient light low. - Choose grating line density based on desired fringe spacing and the distance to your detection screen or sensor. Suitable for - Physics and optics students, lab instructors, educational labs, and researchers conducting basic diffraction and interference experiments. Note: The kit provides a practical, specification-driven set of apertures and gratings for experimental optics. Use with appropriate optical mounts and safety procedures when operating lasers or bright light sources.