« Page:Henri Poincaré - Théorie mathématique de la lumière, Tome 1, 1889.djvu/291 » : différence entre les versions
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{{nr||DOUBLE RÉFRACTION|277|}} |
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DOUBLE RÉFRACTION |
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277 |
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{{c|<math> \xi_1=h\xi,\qquad \eta_1=k\eta,\qquad \zeta_1=l\zeta. </math>|m=1em}} |
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;, = fil, |
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-ni = A-r,, |
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Ç, = fl;. |
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{{c|<math> |
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(\rho+\rho_1) h\,\frac{d^2\xi}{dt^2} = \Delta x - \frac{d\Theta}{dx}, |
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</math>|m=1em}} |
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l |
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' |
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i |
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1 |
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{{c|<math> |
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P+P)^=-' |
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\rho+\rho_1 h = \frac{1}{a},\qquad |
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P+Pi^=^' |
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\rho+\rho_1 k = \frac{1}{b},\qquad |
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P-| -P)^=- |
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\rho+\rho_1 l = \frac{1}{c},\qquad |
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</math>|m=1em}} |
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1 rf2ï |
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clQ |
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TT=A;—^~' |
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{{MathForm1|(1)|<math> \begin{align} |
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a dt^ |
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\frac{1}{a} \frac{d^2\xi }{dt^2} &= \Delta\xi - \frac{d\Theta}{dx}, \\[1.5ex] |
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dx |
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\frac{1}{b} \frac{d^2\eta }{dt^2} &= \Delta\eta - \frac{d\Theta}{dy}, \\[1.5ex] |
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1dK |
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\frac{1}{c} \frac{d^2\zeta}{dt^2} &= \Delta\zeta - \frac{d\Theta}{dz} \cdot \\ |
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d& |
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\end{align} </math>|m=1em}} |
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c df^ |
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"~ |
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'''177. Propagation d’une onde plane.''' — Soient <math>\xi,\,\eta,\,\zeta</math> |
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^ dz' |
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les composantes des vibrations d’une onde plane ; nous |
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— |
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Soient;, 7),^ |
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{{MathForm1|(2)|<math> |
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les composantes des vibrations d'une onde plane ; nous |
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\xi = \mathrm{L}_0 e^\mathrm{P},\qquad |
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\eta = \mathrm{M}_0 e^\mathrm{P},\qquad |
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(2) |
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\zeta = \mathrm{N}_0 e^\mathrm{P} . |
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^=v^ |
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</math>|m=1em}} |
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rl=^v^ |
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î: = Noe^ |