Get a copy of What If? 2 and Randall’s other books at: https://xkcd.com/booksMore serious answers to absurd questions at: https://what-if.xkcd.com/This quest...
Sand isn’t round enough, nor are most grains clear. You’d need perfect clear quartz beads.
And then the index of refraction would be different, so the rainbow would be all messed up.
Sand isn’t round enough, nor are most grains clear. You’d need perfect clear quartz beads.
And then the index of refraction would be different, so the rainbow would be all messed up.