Is light a particle? Or is it a wave? Find the answer by yourself with this amazing physics experiment! Explore the laws of physics in a practical manner with this model. Print the holder, the diaphragm and turn on your laser to see the results!

Assemble the experiment as shown below, turn on your laser and point it to the middle of one the three windows in the diaphragm. Point it to a wall that's reasonable far away from the laser. Turn off your lights for better results!

I've included two diaphragm models, one for a 0.2 nozzle, and another for a 0.4 nozzle. The 0.2 version should show better results, but both will work well.

To know more about the dual-slit experiment, check this amazing video: 

Or read more about it here: [https://en.wikipedia.org/wiki/Double-slit_experiment](https://en.wikipedia.org/wiki/Double-slit_experiment)

Do you like my models? Consider buying me a coffee ;)

Parts

• The printed holder
• Printed diaphragm
• One toy laser, with shaft diameter up to 16mm (power less than 5mW!) - For example: [https://www.amazon.de/Toozey-Pointer-Rechargeable-Patterns-Interactive/dp/B0CGPLRHTC/](https://www.amazon.de/Toozey-Pointer-Rechargeable-Patterns-Interactive/dp/B0CGPLRHTC/)

DISCLAIMER: Lasers can be dangerous, never point one directly at your eyes, and make sure you are getting one that has a low power output. Stronger lasers can poke a hole in your retina even with its reflection. Avoid blue and green lasers! If you are a kid, do this experiment with the presence of a responsible adult.

Print Settings

Supports:

No.

Resolution:

• Holder: 0.2mm height with 0.4 mm nozzle
• Diaphragm:
  • 0.2 nozzle: 0.1mm height
  • 0.4 nozzle: 0.16 height

Walls/Perimeters:

• Holder: 3
• Diaphragm:
  • 0.2 nozzle: 3
  • 0.4 nozzle: 2

Infill:

15% or more.

Filament:

Any.