The visible light used by photographers to produce images is just one part of a range of ‘electromagnetic’ radiations. If a prism is positioned in such a way that a narrow shaft of sunlight passes through it, then a spectrum of colours will be seen emerging from the other side. The prism refracts (bends) the light rays according to their colour, with red refracted the most and violet refracted the least. The spectrum of visible light split by the prism, or seen in a rainbow, for example, begins at the violet or blue end of the spectrum and continues through green, yellow, orange and red. Violet colours have a wavelength of approximately 400nm, green at around 550nm, and red to approximately ...
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