How to make a rainbow disappear

[dllavaneras]

I went out to help my mom unload some things from her car, looked left and saw this:



I then wondered what would happen if I used the polarizer, and it turns out that it's super cool! Just take a look at this video I took.
That's all I could get, since it was starting to rain, so I didn't have time to fiddle with the settings to be able to get a really good pic. :-\ Still, I love the effect!

BTW, can anyone explain why the rainbow disappears? I was facing away from the sun when I took that pic/video.

 

[QuarterSwede]

Basically it filters out the rainbow's waves. Take a peek at wikipedia for a more detailed explanation.

 

[dllavaneras]

Thanks I had an idea, but for some reason I thought that it would actually enhance the colors of the rainbow, not make them disappear!

 

[thr33face]

thank you for that rather nice demonstration.

 

[penter]

pretty cool

 

[wmmk]

Cool! Gotta love the wacky science of optics and light...