Laser Diffraction Pattern Cap
thingiverse
This device generates a laser diffraction pattern on the spot. Simply print it out and stretch a thin material across its end, securing it with glue. Attach this setup to a laser pointer and point it directly at a screen like a white wall. The device can be easily resized for use with various size laser pointers. For more information about how this works, visit https://www.olympus-lifescience.com/en/microscope-resource/primer/lightandcolor/interference/.
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