. The American journal of science and arts. arizedby the refraction of each of the surfaces of the plate. Now the partof the pencil AI which suffers a first reflexion from each of the sur-faces of the plate, is, as we shall presently show, defective in polar-ized light compared with that which has experienced two refractions,so that it requires the above additional quantities to produce a com-pensation with the transmitted pencil BO. If this is not the truecause of the apparent compensation, that is, if M. Arago took meansto exclude the reflected pencils which seem to have produced thecompensa
. The American journal of science and arts. arizedby the refraction of each of the surfaces of the plate. Now the partof the pencil AI which suffers a first reflexion from each of the sur-faces of the plate, is, as we shall presently show, defective in polar-ized light compared with that which has experienced two refractions,so that it requires the above additional quantities to produce a com-pensation with the transmitted pencil BO. If this is not the truecause of the apparent compensation, that is, if M. Arago took meansto exclude the reflected pencils which seem to have produced thecompensation, we must then ascribe the equality of the two imagesto inaccuracy of observation. But even if we admit that M. Aragos experimental results arecorrect with regard to plates, it necessarily follows that they cannotbe true with regard to surfaces; for it is obvious from the slightestconsideration of the subject, that the phsenomena of the one cannever be interchangeable with those of the other. Transparent Plates upon Light. Fig. 3. 31. In order to demonstrate these views by an analysis of the changeswhich the intromitted light experiences from the two refractions andthe intermediate reflexion of a transparent plate, I took a plate ofglass of the shape MN (Fig. 3.) having an oblique face M d cut uponone of its ends. A ray of light R A, polarized -]- 45° and - 45°,was made to fall upon it at A, at an angle of incidence of nearly 83°,so that the inclination of the planes of polarization of the reflectedray A P was about 36^°. Now the ray A C after reflexion in thedirection C S, without any refraction at B, where it emerges perpen-dicularly to. M d, would also have had the inclination of its planes ofpolarization equal to 36^° if there had, been no intermediate refrac-tion at A 5 but this refraction alone being capable of producing aninclination of 53° or a rotation of 53° —45° = 8°, and this rotationbeing in an opposite direction from that produced by the second re-f
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Keywords: ., bo, bookcentury1800, bookpublishernewhavensconverse, bookyear1820
