The wavelength of light is so small we normally don't see its effects or even appreciate how tiny it actually is. Measuring the wavelength of light used to require lab equipment but these days everything you need is commonly available in your home or office and this video shows you how to do it.

The most exotic thing needed for this experiment is laser printer compatible transparency sheets, sill available but less common these days now that overhead projectors have largely been supplanted by video projectors. What else do you need? A laser printer with a network port, and something with laser I used an IR temperature gun but a laser pointer would work too. And a measuring tape.

Software and files to print the diffraction grating are now on github.

https://github.com/electromagneticvid...

Download everything and read the README_and_HOWTO to file for instructions.

There is a pinned first comment for this video. Please put any comments or discussion concerning the software as a reply to that pinned comment so all the software related stuff is together.