That part of it is essentially high school physics. I'd go easy on that. I'd keep it hands on. A pinhole or camera obscura setup would be good simple hands-on, then graduate to LF.
If you've got a place for it and the time, cyanotypes are fun for all ages. I did cyanotype photograms (about 80 of them!) at a mini maker faire with kids of all ages. Use thinner paper so it dries/exposes faster.
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