Gratings with a size of 50 * 50mm, and the size of observation hole is 35 * 23mm.
Detailed parameters:
1. Single Slit: Slit width is 0 05, 0. 1 and 0.2mm
2. Double Slits: The slit width is 0.05mm, and the distance between 2 slits is 0.2, 0.3, and 0.45mm
3. Round Holes: The diameters of the holes are 0.2, 0.3 and 0.4mm
4. Combination: The combination piece consists of single slit, double slits, three slits, four slits, multiple lines, round hole, square, rectangle, triangle. The slits widths of single slit, double slits, three slits, four slits are 0.06mm and the distance between 2 slits is 0.05mm. Round hole: Ø 0.36mm, triangle: 0.3*0.3*0.3mm, square: length*width: 0.2*0.2mm, rectangular: length*width: 0.6 * 0.28mm.
