Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 43
answer to these prisms are a crownbiconvex, fitting into a flint plano-concave of double the dispersivepower. It has been pointed out above that all the other colours lie intheir proper order between the rays R and V (fig. 5). Let us selectone, green, and represent it by G. Now if G lies midway… … ACHROMATIC OIMKCTIVKS one kind of glass is proportionMl to their dispersion in the other,then when any two are destroyed the third is destroyed with them.This unfortunately is not the case in practice, because two kinds ofglass having proportional dispersion powers cannot be obtained.This, however,…
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