## Crystallography: The Ray-surface, the Optical Indicatrix, and Their Interrelation : an Elementary Presentation for Petrographers |

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analytic geometry angle of incidence anisotropic anisotropic crystal axes biaxial crystal birefringence called the optic circle circular sections conjugate construction of Problem crystal plate directions and velocities draw electromagnetic theory elliptical section end of unit equation extraordinary wave given ray Given the direction given wave-normal gives rise incident wave-normal indicatrix perpendicular indices intersects the indicatrix isotropic Johannsen lastly the vibration law of refraction light longest dimension major and minor microscope mineral minor diameter NOS2 OPi and OP2 optic axis optical crystallography ordinary wave parallel Pass a plane petrographers Pi and P2 PiQi plane tangent polarizing prism practical problems principal section radius representing ray-surface of biaxial ray-surfaces of crystals ray-velocities rays are propagated rays associated reciprocal refractive index represent the refractive representing the vibration Required to find rotation-axis rotatory power sents the refractive tangent plane tetragonal theorems triaxial ellipsoid triclinic velocity that varies wave-front wave-normal corresponding wave-normals associated wave-velocities waves propagated