Crossed Prisms With Spectra #2
by Science Photo Library
Title
Crossed Prisms With Spectra #2
Artist
Science Photo Library
Medium
Photograph - Photograph
Description
Prisms demonstrating refraction of white light into the visible spectrum. Beams of white light strike the prisms and are dispersed onto the opposite faces. At these faces, some of the light is refracted again, exiting the prism and forming the spectrum. The spectrum is a result of the different amounts of refraction of the different wavelengths of light present. In Isaac Newton's time, it was believed that white light was colourless, and that the prism itself produced the colour. Newton's experiments convinced him that all the colours already existed in the light in a heterogeneous fashion, and that corpuscles" (particles) of light were fanned out because particles with different colours travelled with different speeds through the prism."
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October 7th, 2018
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