Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . But if a prism, A (Fig. 33), is struck by an oblique ray, R, the ray is dispersed in theglass, and the colored rays leave the prism diverging, and they cannot be properly mixedagain to white light, except we can give to the leaving rays their parallelism 54 Wilsons quarter century in photography. view. As an illustration we may compare this action with the effect of com-bining, to form an image, part of the picture of an object seen with one eye,with ano
Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . But if a prism, A (Fig. 33), is struck by an oblique ray, R, the ray is dispersed in theglass, and the colored rays leave the prism diverging, and they cannot be properly mixedagain to white light, except we can give to the leaving rays their parallelism 54 Wilsons quarter century in photography. view. As an illustration we may compare this action with the effect of com-bining, to form an image, part of the picture of an object seen with one eye,with another part as seen by the other. Now a glance at the cut will show usthat the pencils which pass the optical centre are not such as would have metat a single point, for while the angles of the different rays w the lens, with acommon centre, C, are in proportion to each other as their arcs, those formedby prolongation of D G, D^ G, D G toward as refracted rays, are inproportion to each other as their sines. Fig. 34.
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Keywords: ., bookcentury1800, bookdecade1880, bookidwilsonsquart, bookyear1887
