CONTENTS. IX 



Page. 



polarized ray. (168, 169) Angles of polarization ; Brewster' s law. 

 (170) Polarization by a plate bounded by parallel surfaces ; by a pile of 

 plates. (171) Law of Malus. Common light equivalent to two polarized 

 rays of equal intensity, whose planes of polarization are perpendicular. 

 (172) Light partially polarized by reflexion. (173) Light partially 

 polarized by refraction; Law of Arago. (174) Light completely 

 polarized by transmission through a pile of plates. (175) Polarization 

 by transmission through a plate of tourmaline. (176, 177) Modes 

 of producing a polarized ray of strong intensity by means of double 

 refraction. Nicol's prism. (178) Phenomenon observed by Haidinger 

 polarized light distinguishable by the naked eye, 151 



CHAPTEE X. 



TRANSVERSAL VIBRATIONS THEORY OF REFLEXION AND REFRACTION OP 

 POLARIZED LIGHT. 



(179) Newton's objection to the wave-theory, derived from the phenome- 

 non of polarization, removed. (180) Propagation of wave by trans- 

 versal vibrations illustrated. (181) Evanescence of the normal 

 vibrations experimentally proved. (182) Direction of the vibrations 

 in polarized ray two hypotheses; experimentum crucis of Professor 

 Stokes. (183) Fresnel's theory of the reflexion and refraction of 

 polarized light. (184, 185) Amplitudes of the reflected and refracted 

 vibrations deduced. (186) Intensities of the reflected and refracted 

 rays. (187) Intensity of light reflected at extreme incidences. 



(188) Partial polarization by reflexion and refraction; law of Arago. 



(189) Complete polarization of reflected light; law of Brewster. 

 (190, 191) Change of plane of polarization by reflexion and refraction, 166 



CHAPTER XI. 



ELLIPTIC POLARIZATION. 



(192) The vibration of the ethereal molecules is generally elliptic. 



(193) An elliptic vibration the resultant of two rectilinear vibrations. 



(194) Direction of axes of the ellipse, and ratio of their lengths. 



(195) Elliptic polarization by total reflexion. (196) Circular polarization ; 

 Fresnel's rhomb. (137, 198) Laws of metallic reflexion discoveries 

 of Malus and Brewster. (199) Light reflected from metals elliptically 

 polarized. (200) Intensity of reflected light determined experimentally 

 by M. Jamin. (201, 202) Difference of phase of the two compo- 

 nents. Effects of successive reflexions. (203) Action of transpa- 



