The Photographic art-journal . 1. we float, one upon the other, fluids, &,<?,£?,having different powers of refraction, wea. 1853. The Photographic Art-Journal. 245 shall then see the relative phenomena ex-hibited by the bending of the ray a a, inpassing through them (Fig. 2). It willbe evident that no great difficulty exisfs inmeasuring the refractive powers of differenttransparent bodies : and that h mce we areenabled to tabulate those which have thehighest and lowest refractive indices. Afew of the most important are given in thefollowing table :— Air 1-000294 Water 1336 Alcohol 1*372 Oil
The Photographic art-journal . 1. we float, one upon the other, fluids, &,<?,£?,having different powers of refraction, wea. 1853. The Photographic Art-Journal. 245 shall then see the relative phenomena ex-hibited by the bending of the ray a a, inpassing through them (Fig. 2). It willbe evident that no great difficulty exisfs inmeasuring the refractive powers of differenttransparent bodies : and that h mce we areenabled to tabulate those which have thehighest and lowest refractive indices. Afew of the most important are given in thefollowing table :— Air 1-000294 Water 1336 Alcohol 1*372 Oil of cloves 1-535 Crown glass 1 534 Plate glass 1 542 Flint glass 1 830 Do. containing much lead 2028Diamond 2*439 This knowledge enables us to trace a rayof light through transparent bodies of anyform, provided we can find the inclinationof the incident ray to the surface, where iteither enter* or quits the body. If parallel rays fall upon a plane surfaceG, of gla<s, they will retain their parallel-ism after passing through it as The ray a,(Fig. 3). The rays diverging from the
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectphotogr, bookyear1851
