. The American journal of science and arts. gard tothose expressing natural classes. Art. V.—On the action of the second surfaces of transparent platesupon light; by David Brewster, LL. D. F. R. S. Lond. &£ Edin. Read before the Royal Society, February 25, 1830. In a paper on the Polarization of Light by Reflexion, published inthe Philosophical Transactions for 1815, I showed that the Law ofthe Tangents was rigorously true for the second surfaces of transpa-rent bodies, provided that the sine of the angle of incidence was lessthan tho reciprocal of the index of refraction. The action of thesec
. The American journal of science and arts. gard tothose expressing natural classes. Art. V.—On the action of the second surfaces of transparent platesupon light; by David Brewster, LL. D. F. R. S. Lond. &£ Edin. Read before the Royal Society, February 25, 1830. In a paper on the Polarization of Light by Reflexion, published inthe Philosophical Transactions for 1815, I showed that the Law ofthe Tangents was rigorously true for the second surfaces of transpa-rent bodies, provided that the sine of the angle of incidence was lessthan tho reciprocal of the index of refraction. The action of thesecond surfaces of plates at angles of incidence difterent from themaximum polarizing angle, was studied by M. Arago, who conduct-ed his experiments in the following manner. With respect to this phenomenon, says M. Arago, a remarka=-ble result of experirnent may here be noticed ; that is, that in everypossible inclination A=A,* A is the light polarized by reflexion, and A tiiat polarized by refraction. Transparent Plates upon Light. 29. Let us suppose that a plate of ^ glass ED (Fig. 1.) is placed in theposition that the figure representsbefore a medium AB of a uniformlint; for instance, a sheet of finewhite paper. The eye placed at O,will receive simultaneously the ray 10 reflected at I, and the ray BIO A B transmitted at the same point. Place at m n an opaque diaphragmblackened, and perforated by a small hole at S. Lastly, let the eyebe furnished with a doubly refracting crystal C, which aifords twoimages of the aperture. If now, by means of a little black screen placed between B andI, we stop the ray BI which would have been transmitted, the crys-tal properly placed will give an ordinary image =A-|-^B, and anextraordinary image = JB. But if the screen were placed betweenA and I, and the ray AI were intercepted, we should still have twoimages of the hole, and their intensities would be ^W and A+JBrespectively. Consequently, without any screen, if the whole of thereflected lig
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