I had a full optics passage on my exam... plus a few freestanding. One of which was completely and utterly stupid, and trying to be hard in disguise. I figured that effer out thankfully. (Props to TPR)
I wrote on July 8th this year.
The passage was about a prism, with all sorts of things being done to it. Had never seen anything like it. It wasn't hard, but it was more like a mind f*ck because it almost seemed too easy, like "what am I missing here...?"
Either way, study it, memorize it, understand it, whatever you gotta do to get a 10+ on PS. I for one was happy that there was no crazy circuit passages or electromagnetism on mine.
Good luck!