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The Critical Review, Or, Annals of Literature, Volume 56
The Critical Review Or Annals of Literature Volume 56 Author:Tobias George Smollett Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: Sft tht ray 'by reflection or refraction, before and at incidence, %-hilft the 6th 5s (in addition) a proof that all the rays of any one image, if mixed together... more », compound a beam exactly (inrifar to the beam that wtoat firft-decompounded. The 7th CTtperimerrt (hows, that the Colours into' which the rays are feparated by reflection are homogeneous and unchangeable; that they differ in flexibility and refrangibHiry j that they bear the fame part in forming images by reflection, and fringes by flexion, and colours from thin plates, .which the rays feparated-.,by .the priftn-do: and in the Sth experi- ment we fee, that when the rays are placed in the fame Ctuatioa with refpetYto refracTToh, whether out of a rarer into a denfer or a denfer into a rarer medium, in which they before were with refpeft "to fefleSioh, the pofrtion of'the colours produced is diametrically oppoGte in the two cafes. Seeing then that in all forts of figfci, ireft, refra'ftea, refrefted, fitnple; and hbmogeneou's, or heterogeneous and compounded, 'and'in whatever ifray the feparatibh an4 irnxture trny have been made,fome of the rays at equal or the fame indkfencis are conftantty reflectednearer the perpendiculaT'thari the mean rays, and others not lo near; and feeing that by fuch reflection the compound ray, f whatever'-kind, is feparared into parts ft fimple-tliat heyl-ean-never more l/ef eliariged ; and confidering the different places to which" thefe parts are reflected ; it is evident, tliit the1 fun's-' light cohfiftsbf p'drts different ip reflexibH'rty, -and that thofe whfch1 are1 leaft refrah'git)le are moft reflexible. .By reflexib'!- lity, I here mean'a difjfi6i(o be1/fflefted near to the perpendi- cuUr ia any-degree, ;; ' ' '.-' ' Although I have grren what I take to be fnfficient proof of this pro...« less