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magnifying spherical shell

Use a shell of high refractive index to magnify what is inside
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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 from one angle it would look entirely blue, from another angle entirely red.

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 small polyhedron with each face a different colour. The shell would act as a meniscus lens focusing onto the face of the polyhedron.

For example, a cubic zirconia shell with outer radius of 8cm and 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 could be a globe of the world, thus providing zoomed-in globe. The centre piece could be any interesting small approximately spherical object.

xaviergisz, Apr 30 2021

Lensmaker's equation https://en.wikipedi...ensmaker's_equation
[xaviergisz, Apr 30 2021]

[link]






       I don't understand. Can you both magnify and change the spectrum viewed at the same time?   

       (+) if so.   

       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).
xaviergisz, Apr 30 2021
  

       I think my grandfather had a paperweight a bit like this - but only a bit. I remember boggling at it as a small child.
pertinax, Apr 30 2021
  

       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
beanangel, Apr 30 2021
  
      
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