No need for funky stuff, just do the classic (lol) Young's slits experiment which should be more than enough oddness for anyone.
replyI was shown it at school, using microscope glass slides that we waved over a Bunsen burner running cold, to coat with soot. We then carefully etched parallel lines with a compass by hand. Our (~17 y/o) efforts were a bit random but we did get some smudgy banding results on the screen.
Using a compass is interesting, use two razor blades taped together is much easier and it’s close enough to perfect parallel lines.
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