Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 597
is isolated by intercepting the othersby means of a screen E, as shown in fig. 553, and if the light thus isolatedis allowed to pass through a second prism, B, a refraction will be observed,but the light remains unchanged ; that is, the image received on the screen His violet if the violet pencil… … Moreover, the colours of the spectrum are unequally refrangible ; thatis, the glass of tlie prism possesses a different refractive index for each ofthe rays of whichwhite light is com-posed. The elongatedshape of the spectrumwould be sufficient toprove the unequal re-frangibility of thesimple…
Physics
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