I've seen the discussion about parabolas, but i didn't understand very well
what efect does the black mirror make, does it form a 3D image of a given
shape, i mean does it form like a sort of an holographic 3d image.
Is there other ways to make an holographic effect (touch the spring)
where can i buy A 16 inch (40 cm) diameter concave mirror A 16 inch (40 cm) diameter
concave mirror on the internet, because i live outside USA
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