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Imagine a ball that changed the colour of the entire surface
facing you depending on the direction that you look at it. So
one angle it would look entirely blue, from another angle
The ball is a thick shell of high refractive index material (e.g.
cubic zirconia). Supported
in middle of the shell (e.g. by thin
threads extending from the inner shell surface) would be a
polyhedron with each face a different colour. The shell would
as a meniscus lens focusing onto the face of the polyhedron.
For example, a cubic zirconia shell with outer radius of 8cm
inner radius of 2cm, would have a focal length at the middle of
the shell (if I have used the lensmaker's equation correctly).
Instead of different coloured polyhedron, the centre piece
be a globe of the world, thus providing zoomed-in globe. The
centre piece could be any interesting small approximately
[xaviergisz, Apr 30 2021]
||I don't understand. Can you both magnify and change the spectrum viewed at the same time?
||Not sure where you got 'spectrum' from. The colour you see is
just a magnified view of the surface of the centre piece (e.g.
a polyhedron with different colour faces).
||I think my grandfather had a paperweight a bit like this - but
only a bit. I remember boggling at it as a small child.
||thanks for the nifty title, I tried to guess what it was
about before reading it:
||those little acrylic containers that coin vending machine
toys come in could, if cupped together )) have an air gap
and two separate rotateable lenses making such things as
a magnifier or a kaleidoscope. That would make the toy
even more fun.
||X ray optics based on the dielectric effect could be used
for better CT scanning
||That effect where you can see underwater if your goggles
have an air gap between the eyes and the water, but all
on land. Sort of: a layered stack of lenses with one layer
acting as an air gap equivalent (a GRIN lens).
||[xaviergisz] idea might function even better as a GRIN
(Gradient refractive index) lens, with an imitation air gap
between (((o))) layers