Product Introduction:
Gratings with a size of 50 * 50mm, and the size of observation hole is 35 * 23mm.
Detailed parameters:
1. Single Slit: Slit widths are 0 05, 0. 1 and 0.2mm
2. Double Slits: The slit width is 0.05mm, and the distance between 2 slits are 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 width of single slit, double slits, three slits, four slits are 0.06mm and the distance between 2 slits is 0.05mm.
Round hole: Ø0.36mm, triangle: 0.3*0.3*0.3mm, square: length*width: 0.28*0.28mm, rectangular: length*width: 0.6 * 0.28mm.

Poisson Spot, also known as Arago Spot, is an optical phenomenon caused by the diffraction of light.
When monochromatic light illuminates on a small circular plate or bead of a certain size, annular diffraction fringes of concentric circles will appear on the observation board, and a very small bright spot will appear at the center of all concentric circles, which is called Poisson Spot.

Moire Pattern contains 2 pieces of grating sheet in a package.
This product is only for experimental demonstration and is not a high-precision product. There is no exact quantity of the lines. Please do not buy if you mind.