Is there a Concave Mirror Sphere? ?

Question

My friends was telling me of a teacher that this thing. Inside, it was round and reflective like a mirror. And outside the base was flat so you could put it somewhere. And you could put a penny in there and you would see like if the whole inside was covered with pennies. Have you ever heard of anything like this? What is it, and where can it be bought? Well, thanks.

Answer 1

I know what you're talking about but not what it might be called.  It would be a tesselated or segmented concave mirror.  Imagine a disco-style mirror ball but on a concave surface, perhaps with concave mirrors instead of flat ones.  Each mirror segment reflects an independent image of the penny.  A single concave mirror might be use to display gems or minerals.

Answer 2

i understand the concept, it would be like a kaleidescope (you see all the shapes as you look through the tube into light)

i have never seen one, but it would have to have one opening where it is not reflective (otherwise you couldnt see inside)

ask your friend to ask their teacher... or check in supplies for science teachers... they have lots of cool stuff!