Curiosities of Light And Sight

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A beautiful example is that presented by the pair of short bright spectra formed upon the screen when a double slit is used shaped like the letter V.
The gorgeously coloured V seems to stand out in strong relief like a pair of inclined boards, the nearer edges being red, the farther ones violet. (See Fig. 14.) In many other ways, and with little or no apparatus, any one may easily SOME 0PTI04L DEFECTS OF THE EYE. 103 convince himself that the different con- stituents of white light are not equa
...lly refracted by the lenses of the eye. Look, for instance, at the incandescent filament Fig. 14. — Spectrum formed with V-shaped Slit.
of an electric lamp through a piece* of common dark blue cobalt glass, which has the property of obstructing the coloured rays corresponding to the middle of the spectrum, while transmitting the red and * Or through several pieces superposed.
104 .CURIOSITIES OP LIGHT AND SIGHT.
the_ blue. Seen from a distance of only a few inctes, the filament appears to be pale blue with a bright red border, the blue rays being perfectly focussed, while the red form diffusion circles.


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