Optical Prism Puns

Hello all~ I hope this is an okay place to ask this (if not, I can delete).

I'm looking for a small optical prism for my altar. Essentially, I want a pretty piece of glass that makes rainbows. Does anyone know where I could acquire such an object?

Thanks~

I'm aware of Newton's discoveries using the prism, I'm asking how the prism itself came to be. Was it just by chance someone came across the prisms shape?

So far my googling has only turned up Newton's results and how he discovered the spectrum of colors.

Thank you in advance.

Has anyone on this subreddit ever used a right angle prism with an OMM (like an OGP Smartscope, MicroVu, etc)? I've had some applications where I'm trying to relate two features that are not visible from the same angle, but instead are on perpendicular faces.

I've heard of this technique before, but I'm curious if anyone has tried it and what the results were. Below is a link for an example of the type of prism I'm referring to. If you place one of these next to your part (assuring parallelism using fixturing), the OMM can see both the top and the side (reflected on the prism) concurrently, and you can measure the distance between features on the two faces (but only in one direction - along the prism's length).

https://www.knightoptical.com/stock/optical-components/uvvisnir-optics/prisms/right-angle-prisms/?keyword_session_id=vt~adwords%7Ckt~%2Bright%20%2Bangle%20%2Bprisms%7Cmt~b%7Cta~340333111884&_vsrefdom=wordstream&gclid=Cj0KCQiAiNnuBRD3ARIsAM8Kmlv9vN9DzQKTwiOIofyU3Wej9K1eZSvb6BGpOumOoZ3yOeen549qo1EaAvnREALw_wcB

Thanks!