How many identical prisms were used by Newton in his experiment on dispersion and recombinating effects?
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Answers
Newton's prisms demonstrate dispersion: the division of white light into its component colours, and also their recombination to make white light. This page is one of the support pages for the multimedia tutorials The Nature of Light and Geometrical Optics.
A prism disperses white light into its component colours
Close-ups of refraction in the prism and the spectrum on the screen
Recombination into white light at the second prism
Further information
A prism disperses white light into its component colours
The photograph at left shows the apparatus: a beam of light enters one side of a prism (bottom right) and leaves the other. It is refracted at both interfaces. The beam then arrives at a white screen (top left).
The photo at right has the same view, with the room lights turned off.
Answer:
His experiments in bending light through prisms led, eventually, to the revolutionary discovery of the existence in white light of a mixture of distinct coloured rays, distinguishable when refracted in a prism. In his first experiment he projected the light via a round hole in his shutters.
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