Sounds good! In the future, if you'd like even more precise measurements, theoretically you could use 2 different frequencies or a reflected source, and look a

Sounds good! In the future, if you'd like even more precise measurements, theoretically you could use 2 different frequencies or a reflected source, and look at the interference or superposition of the waves. I'm by no means an expert in this, but I've heard that optical measurement (eg: laser + Michelson interferometer) could theoretically take you down to the nanometer range. But it's easy to go overboard with this, haha. https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-20-5-5658&id=227960 https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-20-5-56... https://iopscience.iop.org/article/10.1088/0957-0233/9/7/004 https://iopscience.iop.org/article/10.1088/0957-0233/9/7/004