Sensei Posted January 31, 2015 Share Posted January 31, 2015 These remind me at school ( long ago now) we were shown a wheel of rainbow colours and when it was spun it looked a grayish whiteproving white light consisted of all the rainbow colours. It's called Newton disc http://en.wikipedia.org/wiki/Newton_disc In CRT TV, LCD, LED, there are just red, green and blue diodes. Link to comment Share on other sites More sharing options...
Strange Posted January 31, 2015 Share Posted January 31, 2015 If we mixed fine sands of rainbow colours we would have a sort of whitish sand. Actually, you would get black - it is the difference between additive (light) and subtractive (pigments) colour mixing. How can we be sure when we see a colour it is a pure colour? By using a spectrometer to measure it, I guess. Link to comment Share on other sites More sharing options...
magnocrat Posted February 2, 2015 Share Posted February 2, 2015 I've spent a few entertaining hours looking at colour and light on the web, its not an easy subject by any means. Like a lot of science it gets tricky when you probe. I supose its the nature of the beast. I discovered the different colours travel at different speeds in glass. A most curious fact and yet in a vaccum they all travel at equal speeds. Link to comment Share on other sites More sharing options...
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