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Rainbow over the road from Ullapool to Torridon, Highland, Scotland
Mock Sun with sunbows and halo, observed from the Arctic Circle, 1873. This phenomenon is caused by atmospheric refraction. From The Atmosphere by Camille Flammarion. (London, 1873)
Parhelia (mock suns) without haloes, observed in England in 1698, (1845). On this occasion the phenomenon, caused by atmospheric refraction, began at 8am when true Sun shone through watery cloud
Parhelia (mock suns) combined with a halo and rainbow, 1721 (1845). This phenomenon, caused by atmospheric refraction, was observed in England in 1721
Newtons experiment splitting white light into the colours of the spectrum by a prism, 1757Newtons experiment showing how white light is refracted by a prism and split into the colours of the spectrum, 1757. The dotted line shows the beam of light entering through the window
Light, c1850. Educational plate showing reflection and refraction, light travelling in straight lines, a burning mirror (13) and Newtons prism experiment (27). (Wurtemberg, Germany c1850)