Quotes · Quote card

Quotation from Opticks by Isaac Newton

“For the Rays to speak properly are not coloured. In them there is nothing else than a certain Power and Disposition to stir up a Sensation of this or that Colour.”

Isaac Newton

Opticks, Book I, Part II, Prop. II, Theor. II (Project Gutenberg text of the 4th edition (London, 1730))

Portrait of Isaac Newton

Newton distinguishes the physical property of a ray from the sensation of colour it produces in the perceiver.

Citation: "For the Rays to speak properly are not coloured. In them there is nothing else than a certain Power and Disposition to stir up a Sensation of this or that Colour." — Isaac Newton, Opticks, Book I, Part II, Prop. II, Theor. II (Project Gutenberg text of the 4th edition (London, 1730)). (id newton-opticks-q2)

Portrait: GodfreyKneller-IsaacNewton-1689, Godfrey Kneller, Public domain.

Download card (PNG)

Quote card: For the Rays to speak properly are not coloured. In them there is nothing else t