“Are not the Rays of Light very small Bodies emitted from shining substances?… Nothing more is requisite for producing all the variety of Colours, and degrees of Refrangibility, than that the Rays of Light be Bodies of different Sizes, the least of which may make violet, the weakest and darkest of the Colours, and be more easily diverted by refracting Surfaces from the right Course; and the rest as they are bigger and bigger, may make the stronger and more lucid Colours, blue, green, yellow and red, and be more and more difficultly diverted.” – Isaac Newton, Opticks (1666-1704) 29th Query. “Light spreads, as Sound does, by spherical surfaces and waves: for I call them waves from their resemblance to those which are seen to be found in water when a stone is thrown into it.” – Christian Huygens, Traité de la Lumière (1690) Text: Abraham Pais, Niels Bohr’s Times, Oxford University Press, 1991, p. 55. Image: double+slit+exp.jpg conquestofthecosmos.blogspot.com

particles or waves?