On Mixing Colors of Light

[Charles Link]

I seem to remember seeing an arrangement of prisms and slits in a work by Isaak Newton. He already sussed out the difference between 'colour' and 'spectrum'. It's certainly not new.

The idea I put forward in the OP two months ago was new to me, (perhaps not to you), but it has now gotten a little old. Right now it would interest me if someone could explain how they can make and mass produce several million or more p-n junctions (photodiodes) in a very tiny space, all with electrical connections, or how they can manufacture a billion or more memory cells on a small memory card, but that would be the subject of another thread.