There are questions that appear more like mathematical excersises than photographic. Question only needs to include the size of a sensor of the camera at hand to make it answerable in MathSE, or PhysicsSE if that's more into it.
Personally I'm happy with any question that asks how to use a camera for this or that subject, be it a laser beam cross section or whatever. We can always answer with "no can do" without acting like MC Hammer "Don't touch it" and closing the question asap. But that's just me having broader view of what's On-Topic, and I've already realized that PhotoSE is not about cameras and how to use them in different ways, this site is about photography.
So, are mathematical puzzles about photography?