During the last three decades, this so-called " fast axis " shifted by 1 longitudinal degree relative to the rest of the Earth, Richards and Song realized by examining seismic waves from numerous earthquakes since 1967.
12.
A linear retarder has a slow axis and a fast axis, and the two axes are orthogonal to each other . Polarized light travels at higher speed when its electric field vector is aligned with the fast axis of a retarder.
13.
A linear retarder has a slow axis and a fast axis, and the two axes are orthogonal to each other . Polarized light travels at higher speed when its electric field vector is aligned with the fast axis of a retarder.
