Isaac Newton – “A Letter… Containing His New Theory about Light and Colours” (fragments)

Isaac Newton explains point by point the conclusions his experiments brought him to. The colour of light is its innate feature, correlated with its refrangibility and there was nothing he could do during his experiments to change the colour of a ray of pure light. Of course there are also light rays which are combined of many different colours and so they may seem to be green, while in fact they are a mixture of blue and yellow. But white light is the combination of all of these, Whenever one colour in the spectrum predominates, it’s going to tinge the resulting colour, that’s why for instance the candle burns yellow and stars have different colours. Finally he writes something about the colours of the rainbow, which I am very sorry I could not understand. I told you I was a physics blockhead.


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